the testing of the type of membrane associated alkaline phosphatase ( ec 3.1.3.1 ) by immunotitration has revealed that there is a shift from a liver-like type of alkaline phosphatase in normal cell cultures of the human diploid fibroblast cell strains wi 26 and wi 38 to a placenta-like variant in cultures of the same cell strains after the transformation by the dna-tumor virus sv 40 , the wi 26 sv 40 and the wi 38 sv 40 cell lines .
C0007634
normal cell
C0016030
fibroblast