we studied the binding and degradation of 125i-labeled epidermal growth factor ( egf ) by umr-106 osteosarcoma cells and the regulation of egf receptor affinity for egf by the phorbol ester 12-o-tetradecanoyl-phorbol-13-acetate ( tpa ) and by treatments that raise intracellular levels of cyclic amp .
C0031586
phorbol ester
C0039654
phorbol