Dictionary of Human Evolution and Biology

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1. chain of three nucleotides in a cistron in DNA that when transcribed are represented by a complementary codon in mRNA. AKA codin.

2. one of a litter or sibship set of size three; the three may be any combination of genetic identity: either two or three may be genetically identical, or all three may be fraternal; an instance of higher-order multiples.

See polyembryony.

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