Formation of complexes composed of activated complement c 1r activated complement c 1s and activated complement c 1 inactivator in human serum on activation of complement c 1 Laurell, A.B.; Johnson, U.; Martensson, U.; Sjoholm, A.G. Acta Pathologica et Microbiologica Scandinavica Section C Immunology 86(6): 299-306 1978 0304-1328 https://eurekamag.com/research/005/480/005480118.php