the synthesis of specific protein has been investigated in primary cultures of dog thyroid epithelial cells , which can be induced to progress into g1 phase , in the presence of insulin , by different types of mitogens : thyrotropin ( tsh ) acting through cyclic adenosine monophosphate ( camp ) , epidermal growth factor ( egf ) , 12-o-tetradecanoyl-phorbol-13-acetate ( tpa ) , or 10 % serum .
C0079395
g1 phase
C0026249
mitogens