A modified competitive inhibition radioimmunoassay for the detection of C3a. Use of 125I-C3 instead of 125I-C3a - Hack, C E; Paardekoper, J; Eerenberg, A JM; Navis, G O; Nijsten, M WN; Thijs, L G; Nuijens, J H (J Immunol Meth, 1988)