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adj 1 a  :  of, relating to, or being an enzyme or protein produced in relatively constant amounts in all cells of an organism without regard to cell environmental conditions (as the concentration of a substrate)  b  :  controlling production of or coding genetic information for a constitutive enzyme or protein < genes>  < mutations>   2  :  being chromatin of a chromosomal region that is condensed into heterochromatin in all cells of an organism rather than just some con*sti*tu*tive*ly adv 

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