What is codon?

Codon is the set of three adjacent nucleotides in DNA or RNA that codes the insertion of one specific amino acid in the synthesis of a protein chain. The term is also used for corresponding sequences of three nucleotides in messenger RNA into which the original DNA sequence is transcribed.
initiation c.’s Codons that act as ‘start’ signals, coding for synthesis of polypeptide
termination c.’s Codons that specify a stop of translation of RNA into protein.

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