Mouse spleen or thymus lymphocytes incubated with monospecific H-2 or Ia alloantisera and then coated with a xenogeneic antimouse Ig serum become specifically resistant to the alloantiserum (and complement) they have been incubated with. This so called "lysostrip method" was used to investigate the molecular interrelationships of antigens in the mouse lymphocyte membrane. The results of this investigation confirm that H-2K and H-2D antigens are carried by two distinct populations of molecules. They provide evidence that the Ia antigens move in the membrane independently of both H2-K and H-2D antigens; and finally they demonstrate absence of any physical linkage between Ig receptors in B cells, on the one hand, and Ia, H-2K, and H-2D molecules on the other hand.

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