[Term]
id: PR:000001403
name: tetraspanin
def: "A protein with four transmembrane domains, small intracellular amino- and carboxyl-terminal regions, and two extracellular loops, a small one (EC1) and a larger one (EC2) of about 100 residues. The EC2 loop contains at least 4 cysteine residues, including a highly conserved 'CCG' motif." [PRO:WCB, Wikipedia:Tetraspanin]
comment: Category=family.
xref: PIRSF:PIRSF002419
is_a: PR:000000001 ! protein