labeling of triton-permeabilized hepatocytes with gamma 32p-atp after treatment with egf for 30 min to 3 h at 37 degrees c , also demonstrated a phosphorylation of ck55 and ck49 as well , implying that the egf-responsive serine protein kinase is detergent insoluble and probably part of the surface membrane skeleton .
C0031715
phosphorylation
C0072402
serine