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1. Production by a cell or aggregation of cells (a gland) of a physiologically active substance and its movement out of the cell or organ in which it is formed. 2. The solid, liquid, or gaseous product of cellular or glandular activity that is stored up in or utilized by the organism in which it is produced. Cf. excretion. [L. se-cerno, pp. -cretus, to separate]
cytocrine s.the transfer of secretory material from one cell to another, such as the transfer of melanin granules from melanocytes to epidermal cells.
external s.a substance formed by a cell and transported outside the cell walls as a means of ridding the cell of the substance or as a messenger to affect the function of other cells.
neurohumoral s.transmission of a nerve impulse across a synapse or to an end-organ by s. of a minute amount of a chemical transmitter such as acetylcholine.
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