The membrane receptor for sex steroid binding protein is not ubiquitous.

The tissue distribution of the membrane receptor for the Sex Steroid Binding Protein (SBP) has been studied, either in estrogen/androgen dependent tissues and in tissues not strictly sex steroid dependent. A specific interaction of SBP with cell membranes has been observed to occur only in estrogen/androgen dependent tissues, some of them had been previously shown by our laboratory and by other authors to possess a specific receptor for the protein. Thus, the sex steroid dependence of the tissue is likely to be determinant for the expression of the membrane receptor for Sex Steroid Binding Protein.