and ras2 is located on chromosome xiv , 2 cm from met4 . we have also constructed by site-directed mutagenesis a missense mutant , ras2val19 , which encodes valine in place of glycine at the nineteenth amino acid position , the same sort of missense mutation that is found in some transforming alleles of mammalian ras genes .
C0017890
glycine
C0002520
amino acid