in contrast , a mutant whose src protein had the dipeptide asp-leu substituted for amino acids 2 to 81 and a mutant with the tripeptide asp-leu-gly substituted for amino acids 2 to 15 were transformation defective , and the mutant proteins did not associate with membranes and were not labeled with [ 3h ] myristic acid .
C0033684
protein
C1564139
mutant proteins