In an in vivo study in mice, suppression by the C3-cleaving protein of cobra venom (CoF),
and other C3-reactive agents (zymosan, aggregated IgG, anti-C3 antibodies, and type III …

It has been proposed that two distinct signals are required for the triggering of the precursors
of antibody-forming bone marrow-derived cells (B cells):(a) the binding of antigen or of a …

Abbreviations: CoF, cobra factor, the complement activating protein of cobra venom; SRBC,
sheep red blood cells; CRL, complement receptor lymphocyte (s); DNP and TNP, dinitro-and …

The complement system, particularly the third component, plays an important modulatory
role in the inductive phase of the immune response. As discussed here by Anna Erdei and …

ALTHOUGH there is substantial evidence for cell cooperation in the induction of various
allergic responses, there are few data concerning the mechanisms of the cellular …

The third component of complement C3 has been implied in the stimulation of B
lymphocytes to proliferation and maturation for Ig secretion. We have reinvestigated the …

The immunochemical depletion from serum of C3b inactivator (KAF) has been performed
using purified F (ab′) 2 antibody. In vitro KAF depletion leads to spontaneous activation of …

In the present article we describe a simple rosette assay for detection of C3 receptor‐
bearing B lymphocytes with complement (C)‐coated zymosan (Zy) beads. Zy coated with …

In the present study it was shown that normal peripheral lymphocytes have two different
complement receptors: one for C3b (the immune adherence receptor) and one for C3b …

Evidence has accumulated indicating the existence of a second complement activation
mechanism which is functionally analogous to C1, C2, and C4. The noncomplement protein …