| complementarity | 1. The degree of base-pairing (A opposite U or T, G opposite C) between two sequences of DNA and/or RNA molecules. 2. The degree of affinity, or fit, of antigen and antibody combining sites. (05 Mar 2000) |
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| complementarity determining regions | That part of an antibody or T-cell receptor variable region that binds with antigen or antigen/major histocompatibility molecule. (05 Mar 2000) |