Protein sy'n cael ei godio yn y corff dynol gan y genyn CST5 yw CST5 a elwir hefyd yn Cystatin D (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 20, band 20p11.21.[2]
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"A sequence variation in the human cystatin D gene resulting in an amino acid (Cys/Arg) polymorphism at the protein level. ". Hum Genet. 1993. PMID8444475.
"Localization of the human cystatin D gene (CST5) to chromosome 20p11.21 by in situ hybridization.". Cytogenet Cell Genet. 1993. PMID8422752.