catalytic activity:Preferential cleavage: Arg-|-Xaa, Lys-|-Xaa.,cofactor:Binds 1 calcium ion per subunit.,PTM:Sulfated on tyrosine.,similarity:Belongs to the peptidase S1 family.,similarity:Contains 1 peptidase S1 domain.,
Secreted, extracellular space.
Expressed in Paneth cells, at the base of small intestinal crypts.
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