PTM:Undergoes proteolytic cleavage by furin protease to yield a 60 kDa soluble form that forms an homotrimer and exhibits a low affinity interaction with heparin.,similarity:Contains 5 collagen-like domains.,subunit:Homotrimer.,
Cell membrane ; Single-pass type II membrane protein ; Extracellular side .
Brain,Placenta,Testis,