[sahy-tuh-seen, -zeen, -sin]
a pyrimidine base, C4H5N3O, that is one of the fundamental components of DNA and RNA, in which it forms a base pair with guanine. Symbol: C
Origin of cytosine
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A pyrimidine base that is an essential constituent of RNA and DNA.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
A pyrimidine base that is a component of DNA and RNA, forming a base pair with guanine. Chemical formula: C4H5N3O.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.