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operating income
operating lease
operating leverage
operating microscope
operating risk
operating room
operating system
operating table
operating theatre
operation
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operator gene
op·er·a·tor gene (plural op·er·a·tor genes)


noun 
Definition:
 
first gene in a sequence: a gene that controls the transcription of the other genes in the functional unit
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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