Members of this family are common in extracellular regions of vertebrate species

1: Solution structure of the active domain of tissue inhibitor of metalloproteinases-2. A new member of the OB fold protein family. Williamson RA, Martorell G, Carr MD, Murphy G, Docherty AJ, Freedman RB, Feeney J; Biochemistry 1994;33:11745-11759. PMID:7918391