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countable and uncountable, plural uracils
(organic chemistry) One of the bases of RNA, pairing with adenine. quotations examples
We did have some success with uracil when we would preincorporate the uracil into a mutant of E. coli that had a uracil requirement and then feed this cellular content from E. coli.
2013, W. C. Corning, Stanley C. Ratner, Chemistry of Learning: Invertebrate Research, page 191