A class of enzymes catalyzing epimeric changes.
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epim·er·ase (ə-pimґə-rās) a term used in the names of some enzymes of the subclass racemases and epimerases [EC 5.1] to denote those that catalyze inversion of the configuration about an asymmetric carbon atom in a substrate having more than one center of asymmetry; thus epimers are interconverted.Medical dictionary. 2011.