Molekal kasta wuxuu leeyahay taxane amino acid u gaar ah oo lagu qeexay taxanaha nucleotide ee gen codsanaya borotiinkan. Koodhka hidde-wadaha wuxuu ka kooban yahay seddex nucleotide oo loo yaqaan codons iyo isku-darka kasta oo saddex nucleotide ah wuxuu tilmaamayaa amino acid, tusaale ahaan AUG (adenine-uracil-guanine) waa koodhka methionine. Sababtoo ah DNA-du waxay ka kooban tahay afar nucleotides, tirada guud ee codons suurtagalka ah waa 64; sidaa darteed, waxaa jira xoogaa xadidan oo ku jira koodhka hidde-wadaha, iyadoo qaar ka mid ah amino acids ay ku qeexan yihiin in ka badan hal codon.
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