the submicroscopic film of immune serum protein deposited upon the cell surface during sensitization , and completely analogous to the precipitate formed in a soluble antigen-antibody reaction ( e.g. , sheep serum vs. rabbit anti-sheep serum ) acts as absorbent , the degree of sensitization ( size of the film ) determining the amount of complement `` '' fixed '' '' ( adsorbed ) .
C0229671
serum
C0009498
complement