Protein sy'n cael ei godio yn y corff dynol gan y genyn CGB2 yw CGB2 a elwir hefyd yn Choriogonadotropin subunit beta variant 2 (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 19, band 19q13.33.[2]
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