the cellular transformation induced by viral tyrosine protein kinases may result from the excessive phosphorylation of the normal polypeptide substrates of endogenous cellular tyrosine kinases , from the phosphorylation of proteins that are not normal substrates of cellular tyrosine protein kinases in uninfected cells , or from the phosphorylation of proteins of each type .
C0033681
tyrosine protein kinases
C1158886
phosphorylation