Protocol
Section1
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Western Blotting protocol
1、Prepare of Proteins
1.1 Culture E.coli BL21(DE3) with LB(l) medium overnight at 37℃, 200rpm
1.2 Add 1ml overnight culture into 5ml new LB(l) medium for 1 hour at 37℃, 200rpm
1.3 Induce culture by IPTG (with final concentration of 0.5mM) more than 4 hours, while the OD600 is 0.6
1.4 (Lysis) Add 1.5ml lysozyme (1mg/ml) into 2ml centrifuged and the supernatant discadred strain, 30℃ for 30 minutes
1.5 (Degeneration) Add SDS loading buffer and put the centrifugal tube into boiled water for 10 minutes
2、Prepare SDS-PAGE gel, Running buffer, Trans buffer and TBST Washing buffer
SDS-PAGE:
12% Separation Gel(the lower gel):
30%Acr-Bis 3.2ml
1.5M Tris-HCl(pH=8.8) 2ml
10%SDS 80μl
10%AP 80μl
TEMED 3μl
H2O 2.64ml
Total 8ml
5% Spacer Gel(the upper gel):
30%Acr-Bis 500μl
1.5M Tris-HCl(pH=6.8) 500μl
10%SDS 40μl
10%AP 30μl
TEMED 3μl
H2O 2ml
Total 3ml
1×Running buffer:
Tris 3.03g
Glycine 14.4g
10%SDS 10ml
Add ultra pure water to 1L
Store at 4℃
1×Trans buffer:
Tris 3.03g
Glycine 14.4g
10%SDS 10ml
Methanol 200ml
Add ultra pure water to 1L
Store at 4℃
1×TBS buffer:
Tris 2.4g
NaCl 8.7g
Adjust pH=7.6 with HCl
Add ultra pure water to 1L
TBST Washing buffer:
TBS 500ml
Tween-20 250μl
Blocking buffer:
Add 2.5g no-fat dry milk into 50ml TBST Washing buffer
Prepare Blocking buffer only when using it
3、Protein transfer and Immunodetection
3.1 Add 15μl sample and 5μl Protein marker
3.2 Add Running buffer for electrophoresis with a constant voltage at 100V for about 25 minutes, then change voltage into 200V for 40 minutes (adjust the former time by the marker)
3.3 Open the package and cut the upper spacer gel
3.4 Prepare the same size PVDF membrane and put into Trans buffer for 5 minutes before trans-membrane
3.5 Open gel cassettes and put the gel on the PVDF membrane sandwiched between two pieces of blotting paper(always filter paper)
Mind the order of gel and PVDF membrane between the electrodes, black end with gel for negative electrode and white end with PVDF membrane for positive electrode.
3.6 Add Trans buffer for electrophoresis with a constant current at 350mA for 65 minutes(Crowd with ice at a 4℃ temperature )
3.7 After trans-membrane, wash PVDF membrane with 10ml TBST for 10 minutes with gentle shaking
3.8 Add 10ml Blocking buffer with gentle shaking for 1 hour at room temperature or 4℃ overnight
3.9 Wash PVDF membrane with 10ml TBST for 10 minutes with gentle shaking
3.10 Add 10ml diluted(1:5000) primary antibody for 2 hours at room temperature or 4℃ overnight with gentle shaking (primary antibody can be used repeatedly for 10 times)
3.11 repeat step 3.9
3.12 Add 10ml diluted secondary conjugated antibody for 2 hours at room temperature or 4℃ overnight with gentle shaking (seconfary antibody needn’t be repeatedly used)
3.13 repeat step 3.9
3.14 With the ratio of 1:1 to mix Luminous substrate A and B, typically 200-400μl mixture added on PVDF membrane
3.15 Take photos by specific machine and store it
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CRC induction
Subject: C57BL/6 mice strain (6~8 week old)
Material: Azoxymethane (AOM) solution (1mg/ml)
Dextran Sulfate Sodium Salt (DSS) solution (2.0% & 2.5%)
Experiment aim:
After analyzing the qualities of our device that requires testifying meanwhile thoroughly considering the 3Rs principle, we have reduced the need of animal experiments to the least, but for certain qualities the testifying procedure is difficult to replace, refine and reduce experimental animals use. As a result the colorectal cancer mouse model was induced in the minimum amount just to be adequate for product testifying procedure.
Experiment design:
Azoxymethane (AOM) is a chemical agent that can initiate cancer by alkylation of DNA, there by facilitating base mispairings, while Dextran Sulfate Sodium Salt (DSS) is a substance that causes inflammations that will eventually lead to enteritidis.
After being injected into the subject, AOM introduces a carcinogenic environment in vivo, along with DSS consumed, enteritidis is likely to occur and soon develop into colorectal cancer.
Experimental procedure:
After the mice strain stabilizes and being weighed, intraperitoneal injection of AOM solution is given in the amount of 10mg/kg and let rest for a week.
With the AOM injection completed, the DSS induction process begins. One induction cycle lasts for 3 weeks while the complete induction process includes 3 cycles of which. In the first week of the three-week cycle the DSS solution (2.0% & 2.5%) was given as drinking water to our subject. DSS solution was mixed right before it was given to subject to ensure the best results. After one week of consuming DSS, the drinking water for the next two weeks was switched to normal clear water. Repeat the cycle two more times while carefully monitor the weight change of the subject.
Citation:
[1]Ameet I. Thaker, Anisa Shaker, M. Suprada Rao, Matthew A. Ciorba,Modeling Colitis-Associated Cancer with Azoxymethane (AOM) and Dextran Sulfate Sodium (DSS) ,Journal of Visualized Experiments,9/11/2012
[2]Clemens Neufert, Christoph Becker & Markus F Neurath,An inducible mouse model of colon carcinogenesis for the analysis of sporadic and inflammation-driven tumor progression,NatureProtocol, 9/08/2007 -
Structure observation of CRC models—paraffin sectioning and HE staining
Subject: Colorectal tissue from CRC induced mouse model and normal ones
Material: PBS, different concentration of ethanol (50%, 75%, 85%, 95%, 100%), xylene, paraffin wax, haematoxylin and eosin (HE stain)
Experiment aim:
Before using our CRC mouse model for any further experiment, it is essential to first testify the existence of the disease. The exquisite imaging of the cancerous area is also critical in modeling as well as device improvement.
Experiment design:
To maintain the original structure of the tissue, the paraffin sectioning was carry out. After receiving a clear and complete biopsy of the sample, haematoxylin and eosin (HE) stain was performed to get the best vision of the histological structure.
Experiment protocol:
First, a section of colon or rectum was removed from the subjects and longitudinally cut open to form a rectangular piece of tissue. The tissue was then placed on a small cardboard and soaked in paraformaldehyde (PFA) solution overnight. Then the tissue was washed with phosphate buffered saline solution (PBS) three times (10minutes each time). With the tissue cleared from PFA, a series of soaking process was done on decoloring shaker. The soaking process was shown in table below for better understanding.
Table 1.The soaking process of paraffin sectioning
Operation order Soaking solution Concentration Soaking time Remarks 1.1 TNTC 48 11 3.84E+07 1.2 248 41 10 3.28E+07 1.3 172 54 5 4.32E+07 2.1 TNTC 143 20 1.14E+08 2.2 TNTC 153 25 1.22E+08 2.3 TNTC 151 18 1.21E+08 3.1 TNTC 119 16 9.52E+07 3.2 TNTC 125 19 1.00E+08 3.3 TNTC 89 18 7.12E+07 4.1 TNTC 209 16 1.67E+08 4.2 TNTC 130 17 1.04E+08 4.3 TNTC 164 10 1.31E+08 Your title3
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Your title3
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Your title3
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Section3
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2018 Interlab Plate Reader Protocol
Protocols/Transformation-
Western Blotting protocol
1、Prepare of Proteins
1.1 Culture E.coli BL21(DE3) with LB(l) medium overnight at 37℃, 200rpm
1.2 Add 1ml overnight culture into 5ml new LB(l) medium for 1 hour at 37℃, 200rpm
1.3 Induce culture by IPTG (with final concentration of 0.5mM) more than 4 hours, while the OD600 is 0.6
1.4 (Lysis) Add 1.5ml lysozyme (1mg/ml) into 2ml centrifuged and the supernatant discadred strain, 30℃ for 30 minutes
1.5 (Degeneration) Add SDS loading buffer and put the centrifugal tube into boiled water for 10 minutes
2、Prepare SDS-PAGE gel, Running buffer, Trans buffer and TBST Washing buffer
SDS-PAGE:
12% Separation Gel(the lower gel):
30%Acr-Bis 3.2ml
1.5M Tris-HCl(pH=8.8) 2ml
10%SDS 80μl
10%AP 80μl
TEMED 3μl
H2O 2.64ml
Total 8ml
5% Spacer Gel(the upper gel):
30%Acr-Bis 500μl
1.5M Tris-HCl(pH=6.8) 500μl
10%SDS 40μl
10%AP 30μl
TEMED 3μl
H2O 2ml
Total 3ml
1×Running buffer:
Tris 3.03g
Glycine 14.4g
10%SDS 10ml
Add ultra pure water to 1L
Store at 4℃
1×Trans buffer:
Tris 3.03g
Glycine 14.4g
10%SDS 10ml
Methanol 200ml
Add ultra pure water to 1L
Store at 4℃
1×TBS buffer:
Tris 2.4g
NaCl 8.7g
Adjust pH=7.6 with HCl
Add ultra pure water to 1L
TBST Washing buffer:
TBS 500ml
Tween-20 250μl
Blocking buffer:
Add 2.5g no-fat dry milk into 50ml TBST Washing buffer
Prepare Blocking buffer only when using it
3、Protein transfer and Immunodetection
3.1 Add 15μl sample and 5μl Protein marker
3.2 Add Running buffer for electrophoresis with a constant voltage at 100V for about 25 minutes, then change voltage into 200V for 40 minutes (adjust the former time by the marker)
3.3 Open the package and cut the upper spacer gel
3.4 Prepare the same size PVDF membrane and put into Trans buffer for 5 minutes before trans-membrane
3.5 Open gel cassettes and put the gel on the PVDF membrane sandwiched between two pieces of blotting paper(always filter paper)
Mind the order of gel and PVDF membrane between the electrodes, black end with gel for negative electrode and white end with PVDF membrane for positive electrode.
3.6 Add Trans buffer for electrophoresis with a constant current at 350mA for 65 minutes(Crowd with ice at a 4℃ temperature )
3.7 After trans-membrane, wash PVDF membrane with 10ml TBST for 10 minutes with gentle shaking
3.8 Add 10ml Blocking buffer with gentle shaking for 1 hour at room temperature or 4℃ overnight
3.9 Wash PVDF membrane with 10ml TBST for 10 minutes with gentle shaking
3.10 Add 10ml diluted(1:5000) primary antibody for 2 hours at room temperature or 4℃ overnight with gentle shaking (primary antibody can be used repeatedly for 10 times)
3.11 repeat step 3.9
3.12 Add 10ml diluted secondary conjugated antibody for 2 hours at room temperature or 4℃ overnight with gentle shaking (seconfary antibody needn’t be repeatedly used)
3.13 repeat step 3.9
3.14 With the ratio of 1:1 to mix Luminous substrate A and B, typically 200-400μl mixture added on PVDF membrane
3.15 Take photos by specific machine and store it
-
Your title1
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-
Your title2
xxx xx xxxx xxx xxx xxx xx xxxx xxx xxxxx xxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxx
-
Your title3
xxx xx xxxx xxx xxx xxx xx xxxx xxx xxxxx xxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxxx xx xxxx xxx xxxxxxx
- Frequency: 21MHz
- Power for imaging: min(2%)
- Power for collapse: max(100%) (sustaining for 5 minutes)
- Max frame: 50
- Gain: 16dB
- Focus: adjust to the depth of the layer where engineered E.coli lies in.
- Field of view: adjust to achieve the maximum repression of noise and also zoom in on the interest region as much as possible.
Instructions: you have the change not only the main text, but also have to modify the text in the navgation bar on the left side. Now put your content here and do the same for the following sections. xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx Note template is here --- OD OD Optical density .
Section
xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxxxxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxxxxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx
Section3
xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx. The text-link template is here.
2018 Interlab Plate Reader Protocol
Protocols/Transformationsection4
xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx The figure template is here.
section4
Fig 1. The particle standard curve obtained form the 2nd calibration experiment.
xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx The figure template is here.
Fig 1. The particle standard curve obtained form the 2nd calibration experiment.
xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx.
The table template is here.
Table 1. Colony forming units per 0.1 OD600
samples dilution factor CFU/mL 8×104 8×105 8×106 1.1 TNTC 48 11 3.84E+07 1.2 248 41 10 3.28E+07 1.3 172 54 5 4.32E+07 2.1 TNTC 143 20 1.14E+08 2.2 TNTC 153 25 1.22E+08 2.3 TNTC 151 18 1.21E+08 3.1 TNTC 119 16 9.52E+07 3.2 TNTC 125 19 1.00E+08 3.3 TNTC 89 18 7.12E+07 4.1 TNTC 209 16 1.67E+08 4.2 TNTC 130 17 1.04E+08 4.3 TNTC 164 10 1.31E+08 US imaging
We use the Fujifilm VisualSonics / VEVO LAZR-X imaging system and MX250 transducer. The application is set to VA Phantom. Parameters are listed below:
Preparation before imaging: PBS solution is needed to cover the imaging samples allowing the transducer to dip into the solution. Pay attention to not producing any unwanted bubbles.
Instructions: you have the change not only the main text, but also have to modify the text in the navgation bar on the left side. Now put your content here and do the same for the following sections. xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx Note template is here --- OD OD Optical density .
Mouse experiments
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