Wiktionary
periostin
n. (context protein English) A protein normally expressed during cardiac development but also re-expressed following injury to adult tissue
Wikipedia
Periostin
Periostin (POSTN, PN, or osteoblast-specific factor OSF-2) is a protein that in humans is encoded by the POSTN gene. Periostin functions as a ligand for alpha-V/beta-3 and alpha-V/beta-5 integrins to support adhesion and migration of epithelial cells.
Periostin is a gla domain vitamin K dependent factor.