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The key steps of embryonic development and the control mechanisms of liver development. (A) The developmental states presented at different time stages of the embryo. (B) The key control mechanisms of liver formation during embryonic development. ICM, the inner cell mass; AF, anterior foregut; PF, posterior foregut; F, foregut; M, midgut; H, hindgut; FGF, fibroblast growth factor; BMP, bone morphogenetic protein.
