Protein sy'n cael ei godio yn y corff dynol gan y genyn HIST3H2A yw HIST3H2A a elwir hefyd yn Histone cluster 3 H2A (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 1, band 1q42.13.[2]
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