Abstract
Summary
Dopamine markedly inhibited the synthesis of hemoglobin in the area vasculosa of chick blastoderms in vitro without affecting the development of the embryos proper. This effect was more evident in young blastoderms than in old ones. l-dopa, a precursor of dopamine, suppressed hemoglobin formation to a lesser degree. Norepinephrine and epinephrine at a similar concentration were lethal to all blastoderms, whereas serotonin had no visible effect on the hemoglobin synthesis or the development of embryos.
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