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IlGF, insulin_like growth factors; specific to vertebrates. Members include a number of peptides including insulin-like growth factors I and II, which play a variety of roles in controlling processes such as growth, differentiation, and reproduction. On a cellular level they affect cell cycle, apoptosis, cell migration, proliferation, and differentiation. Typically, the active forms of these peptide hormones are single chains cross-linked by three disulfide bonds.
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