DPEP1 and focal segmental glomerulosclerosis: Several potential markers specific only for FSGS include increased levels of cadherin-like 26, RNase A family 1, DIS3-like exonuclease 1 [50], matrix-remodeling protein 8 [51], CD59, insulin-like growth factor-binding protein 7, and roundabout homolog 4 [52], as well as a decrease in the polymeric immunoglobulin receptor and Golgi-associated olfactory signaling regulator [54] or the complete absence of dipeptidase 1 (DPEP1) [52].