<unk> s, often abbreviated as<unk> s, are a group of glycoproteins. They are a subgroup of the<unk> , antigen 5 and Pr-1 (CAP)<unk>  superfamily and also contain a domain related to the ShK toxins. They are substantially implicated in the functioning of the mammalian reproductive system.<unk> s are also found in a variety of snake venoms where they inhibit both smooth muscle contraction and cyclic nucleotide-gated ion channels.
Cysteine-rich secretory protein
Immunoreactive trypsinogen
Polysulfated glycosaminoglycan
Microbiota-accessible carbohydrates
Tetrameric protein
Self-protein
Tumor M2-PK
Intrinsic factor