The heredity and linkage of gene loci were established for two different enzymes with esterproteolytic activity from mouse submandibular gland: protease A and protease E. Based upon strain distribution and biochemical properties of the two esterproteases, the existence of two corresponding structural loci is proposed: Prt-4 (protease A) and Prt-5 (protease E). Prt-4 and Prt-5 proved to be different from Tam-1. From a four-point-cross, the gene order Gpi-1-(Tam-1, Prt-4, Prt-5)-c is suggested. Thus a gene cluster was shown to exist on chromosome 7 coding for esterproteases, all of which are controlled by testosterone.
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