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initiator 1 a gene product that interacts specifically with the
replicator site on a replicon resulting in the initiation of a new
round of DNA replication. 2 a starting point for either nucleicacid
transcription or translation. 3 a carcinogen that initiates
the first stage of carcinogenesis. 4 any compound that, when
added to monomer, initiates a polymerization reaction.

effector 1 or modifier or modulator (in molecular biology) any
small molecule or ligand that interacts with an enzyme thereby
changing its catalytic behaviour but that is not itself changed
during the enzyme action. A positive effector enhances catalytic
activity while a negative effector reduces it. See also
allosteric effector. 2 (in physiology) a cell or organ that produces
a ph

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