bio-gel p-60 chromatography of acid-ethanol extracts from a human placenta , a human tumor , and hamster embryos gave similar patterns of colony-forming activity towards balb/3t3 cells and epidermal growth factor ( egf ) -potentiated nrk cells , although the molecular weight ranges of the active fractions were different among the three sources .
C0086418
human
C0242275
epidermal growth factor