The regulatory subunit is encoded by a diverse set of genes that have been grouped into the B/PR55, B'/PR61, and B''/PR72 families.

These different regulatory subunits confer distinct enzymatic specificities and intracellular localizations to the holozenzyme.

The product of this gene belongs to the beta subfamily of regulatory subunit B''.

Alternative splicing results in multiple transcript variants encoding different isoforms.

This article on a gene on the human X chromosome and/or its associated protein is a stub.