PRB4

Basic salivary proline-rich protein 4 is a protein that in humans is encoded by the "PRB4" gene.
The protein encoded by this gene is a proline-rich salivary protein. This gene and five other genes that also encode salivary proline-rich proteins (PRPs), as well as a gene encoding a lacrimal gland PRP, form a PRP gene cluster in the chromosomal 12p13 region.
PRB4 is post-translationally cleaved into three different mature peptides: