Description
Complement component 3a (C3a) is a protein fragment formed by the cleavage of complement component 3 (C3). The C3 fragment C3a is an anaphylatoxin. It is part of the complement system, which plays a crucial role in innate immunity. It binds to the C3a receptor (C3aR), a G protein-coupled receptor. It has immunoregulatory activity by stimulating a variety of cellular functions