transforming growth factors

trans·form·ing growth fac·tors (TGF),

two polypeptide growth factors; TGF-α stimulates growth of many epidermal and epithelial cells and is obtained from conditioned media of transformed or tumor cells; TGF-β is obtained from kidney and platelets and controls proliferation and differentiation in many cell types.

trans·form·ing growth fac·tors

(TGF) (trans-fōrm'ing grōth fak'tŏrz) Two polypeptide growth factors; TGF-α stimulates growth of many epidermal and epithelial cells; TGF-β controls proliferation and differentiation in many cell types.