Differentiation of the cellular chemical constituents in the embryo prior to cytodifferentiation; sometimes recognizable histochemically. SYN: invisible differentiation.
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che·mo·dif·fer·en·ti·a·tion -.dif-ə-'ren-chē-'ā-shən n differentiation at the molecular level assumed to precede morphological differentiation in embryogenesis
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che·mo·dif·fer·en·ti·a·tion (ke″mo-dif″ər-ən-she-aґshən) the invisible point of decision that precedes and controls actual differentiation of cells into rudimentary organs of the embryo.Medical dictionary. 2011.