Abstract
Human lymphocytes, 10 days after treatment with phytohemagglutinin P (PHA-P), show PLT (secondary in vitro restimulation) reaction patterns which correspond to their cellular (HLA-D) type. Lymphocytes with shared cellular type stimulate PHA primed cells to a lesser degree than the majority of lymphocytes with unshared HLA-D type, which stimulate a strong response. Using a standard 3H thymidine incorporation technique, it is possible to detect responses in as early as 12 hr total incubation time, although usually a 22–48 hr total incubation time is normally required. This method is simple, gives results that correspond to the primary mixed leukocyte response, and thus may be useful as a cross-matching technique for cadaveric renal transplantation.
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