Sex Hormone-Binding Globulin Circulating Level Quantitative Trait Locus, is also known as testosterone circulating level quantitative trait locus, due to sex hormone-binding globulin. An important gene associated with Sex Hormone-Binding Globulin Circulating Level Quantitative Trait Locus is SXGQTL1 (Sex Hormone-Binding Blobulin Circulating Level QTL 1). Affiliated tissues include prostate and breast.