SYN: histidine ammonia-lyase.
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his·ti·dase 'his-tə-.dās, -.dāz n an enzyme occurring esp. in the liver of vertebrates that is capable of deaminating histidine to form urocanic acid
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his·ti·dase (hisґtĭ-dās) histidine ammonia-lyase.Medical dictionary. 2011.