Protein sy'n cael ei godio yn y corff dynol gan y genyn NNMT yw NNMT a elwir hefyd yn Nicotinamide N-methyltransferase (Saesneg). Segment o DNA yw'r genyn, sy'n amgodio ffwythiant arbennig. Mae'r genyn yma wedi ei leoli ar yr edefyn blaen o gromosom dynol 11, band 11q23.2.[2]
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