Abstract
We have used 3H-thymidine uptake to quantitate the mixed leucocyte response. The technique of 3H-thymidine labelling is an important variable in the total mixed leucocyte culture technique. The effect of variations in the specific activity of 3H-thymidine used, the amount of radioactivity added per culture and the time of exposure to 3H-thymidine was studied using a micro-MLC method. Optimum quantitative and qualitative discrimination was obtained by the addition of high specific activity thymidine for an exposure period of 18–24 hr.
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