The fourth component of complement (C4) is crucial to the activation of the classical complement pathway, a key defense against invading microorganisms. The two isotypes of C4, C4A and C4B, have very ...
The complement receptor 1 (CR1) gene encodes a transmembrane glycoprotein that functions in the innate immune system. CR1 is expressed on blood cells and microglia. As a receptor for the complement ...