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cis
or CIS

adj 1  :  characterized by having certain atoms or groups of atoms on the same side of the longitudinal axis of a double bond or of the plane of a ring in a molecule  2  :  relating to or being an arrangement of two very closely linked genes in the heterozygous condition in which one mutant allele and one wild-type allele are on each of the two homologous chromosomes - compare TRANS2   .
abbr carcinoma in situ .
 
 

 
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