Precise mapping of the gene for Ly-21.2 on the 7th chromosome.

We have recently described a murine lymphocyte alloantigen, Ly-21.2, and showed that the gene which controls Ly-21.2 expression is linked to albinism on the 7th chromosome. In order to map the gene more precisely, we have studied the linkage of Ly-21.2 with two other genetic markers on the 7th chromosome, the electrophoretic variant of the beta chain of haemoglobin and glucose phosphate isomerase, in (A/J x C57BL/10)F2 mice. The results of these 3-point cross studies show that the gene encoding Ly-21.2 maps 27 units distal to albinism.