Transkripsiya (az lotini transcriptio – runavis kardan). Akhbor bo rohi dar yake az silsilahoi molekulai KDN sintez shudani molekulai yaksilsilai KRN ba vujud meoyad, ki paydarhamii nukleotidhoi on ba paydarhamii nukleo- tidhoi matritsa (modari) – zanjiri polinukleotidii KDN muvofiqat mekunad.
Mekhanizmi makhsusi «donistani» nuq\tai ibtidoii sintezi safeda, intikhobi zanjiri KDN, ki bo on akhbor hisob karda meshavad, hamchunin mekhanizmi anjomyobii ravand mavjud ast. Ba hamin tariq, KRN-a ba vujud meoyad (rasmi 4.1).