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Factor crescentis insulinoideus 1
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Factor crescentis insulinoideus 1 sive somatomedinum C sive abbreviaturae IGF-1 sive SM-C est proteinum septuaginta aminoacidis de origine hepatica, cuius genum nominis IGF-1 in hominibus chromosomate 12[1] reperiuntur. Nomen insulinoideus de similitudine insulini derivatur. IGF est mediator principalis hormonatis GH (hormon crescentis) per receptorium factoris crescentis insulinoidei 1 (IGF-1R). Adhuc nonnullae functiones notae sunt, per exemplum anabolicae, sed multae obscurae vel vix apprehensae.
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Similiter factor crescentis insulinoideus 2 (IGF-2) receptorium IGF-1 obsidet, IGF-2R exstat, quamquam sine functione ipsa est.