Protein sy'n cael ei godio yn y corff dynol gan y genyn SP1 yw SP1 a elwir hefyd yn Sp1 transcription factor (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 12, band 12q13.13.[2]
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