the middle t antigen encoded by one of these mutants , ppdl1-4 , lacks part of the acidic string of amino acids but not tyrosine 315 ( amino acids 304 through 310 are deleted ) , whereas the middle t antigen encoded by the other mutant , ppdl2-7 , lacks the entire acidic amino acid stretch as well as tyrosine 315 ( amino acids 285 through 323 are deleted ) .
C0815040
acidic amino acid
C0002520
amino acids