Ready-to-use ELISA kits are available for the detection of signal peptide peptidase 3, an alias of the protein, signal peptide peptidase like 3. The official gene symbol is SPPL3. The protein has a mass of 42.3 kDa and length of 384 residues. It is a member of the Peptidase A22B family and may be known by other names, including: PRO4332, MDHV1887, presenilin-like protein 4, presenilin homologous protein 1, intramembrane protease 2, and SPP-like 3, and PSL4.