1. A set of rules, principles, or ethics. 2. Any system devised to convey information or facilitate communication. 3. Term used in hospitals to describe an emergency requiring situation trained members of the staff, such as a cardiopulmonary resuscitation team, or the signal to summon such a team. 4. A numerical system for ordering and classifying information, e.g., about diagnostic categories. [L. codex, book]
genetic c. the genetic information carried by the specific DNA molecules of the chromosomes; specifically, the system whereby particular combinations of three consecutive nucleotides in a DNA molecule control the insertion of one particular amino acid in equivalent places in a protein molecule. The genetic c. is almost universal throughout the prokaryotic, plant, and animal kingdoms. There are two known exceptions. In ciliated protozoans, the triplets AGA and AGG are read as termination signals instead of as l-arginine. This is also true of the mitochondrial c., which, in addition, uses AUA as a code for l-methionine (instead of isoleucine) and UGA for l-tryptophan (instead of a termination signal).
soundex c. a sequence of letters used for recording names phonetically, especially in record linkage.
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