Conclusion: a morphogen gradient can be generated by a source of growth factor(such as BMPor by a localized source of inhibitor (such as chordin). Both mechanisms are used ource o inducer uniformly distributed gradient of inducer extending across field of cells (A) inhibitor distribute source o in gradient inhibito resulting gradient of inducer activity (B) Figure 21-14. Molecular Biology of the Cell, 4th Edition. This is how organizing centers work in embryonic induction. Fig 8Conclusion：a morphogen gradient can be generated by a source of growth factor (such as BMP) or by a localized source of inhibitor (such as Chordin). Both mechanisms are used. Fig. 8 This is how organizing centers work in embryonic induction