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This supports the idea that in embryos from wild-type mothers, dpp H~- mutations cause the transformation of dorsal into ven-tral epidermis. If tissue determined to become dorsal epidermis dies in the dpp rim-null embryos, then one should not see ventral or lateral tissue formed in the double-mutant combination.
Since I posted this question I found some information in Holes Human anatomy & Physiology Pg 533 A negative feedback mechanism utilizing the hormone erythropoietin is released, primarily from the Kidneys....Erythropoietin stimulates... show more I'm working out of Human anatomy & Physiology Laboratory Manual.