Provided below are ELISA kits targeting periostin, a human protein encoded by POSTN. This protein is 836 amino acids long with a reported mass of 93.3 kDa. 7 isoforms have been identified. This is reported to be a secreted protein. Glycosylation sites have been reported. Other alias names for this protein include: osteoblast specific factor 2 (fasciclin I-like), periodontal ligament-specific periostin, periostin osteoblast specific factor, OSF-2, PDLPOSTN, and PN. ELISA kits are available that are reactive to human, rat, and bovine variants of the target antigen.