Protein sy'n cael ei godio yn y corff dynol gan y genyn CYP2R1 yw CYP2R1 a elwir hefyd yn Cytochrome P450 family 2 subfamily R member 1 (Saesneg). Segment o DNA yw'r genyn, sy'n amgodio ffwythiant arbennig. Mae'r genyn yma wedi ei leoli ar yr edefyn ôl o gromosom dynol 11, band 11p15.2.[2]
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