B locus
3.rational specific sra. Sice 1930 the authors have designated 58 sera as typing reagent, contaiing 18 kinds of specific sera. Using these typing reagents, HLA-A Lceus antigen g ne frquency of Han nation in Shenyang ara was found to be 0.726, with the blank 0.244, HLA-B Locus antigen gene frquerey 0.778, with the blank 0.222.
7.The expressions of neotenous characteristics have been observed in ADH, GOT, α-GPDH, LDH, MDH, ME, POX and SOD. Among them LDH is coded with A and B loci, and C locus is not expressed, probably resulting from the neoteny occurred at early stage of development when the LDH C gene had not been expressed.
8.In this paper PCR-SSCP technique was used to analyze the polymorphisms of the tenth exon of GHR gene in Qinchuan cattle. The results showed that PCR products demonstrated polymorphisms in Qinchuan cattle and the population was at Hardy-Weinberg equilibrium(P > 0.05) . There were three allele gene A、B、C in this locus with the corresponding frequencies of 0.5956,0.2905 and 0.1140.The amplified fragments of homozygosis genotype were sequenced.

