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| Secreted
peptide factor |
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- Main families
- Wnt (Wodarz and Nusse 1998)
- fibroblast growth factor (Szebenyi and Fallon 1999)
- TGF-_ superfamily (Massague and Chen 2000)
- platelet-derived growth factor (Betsholtz et al.2001)
- ephrin Bruckner and Klein 1998)
- Hedgehog
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