- KLK31P is a novel androgen regulated and transcribed pseudogene of kallikreins that is expressed at lower levels in prostate cancer cells than in normal prostate cells. Lu, W., Zhou, D., Glusman, G., Utleg, A.G., White, J.T., Nelson, P.S., Vasicek, T.J., Hood, L., Lin, B. Prostate (2006)