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Noun ada has 1 sense
- adenosine deaminase, ADA - an enzyme found in mammals that can catalyze the deamination of adenosine into inosine and ammonia; "ADA deficiency can lead to one form of severe combined immunodeficiency disease"; "the gene encoding ADA was one of the earlier human genes to be isolated and cloned for study"
--1 is a kind of enzyme
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