Like T cells, B cells require multiple signals for activation.
Antigen binding to the B cell antigen __________provides one
signal, while antigen-specific effector ________ provide the other
signals. The requirement for multiple signals to activate either a
T cell or a B cell helps to prevent _______ and dangerous
activation of _________ , including __________
_________. Most of the proteins involved in cell–cell recognition
and antigen recognition in the immune system,
including _________ , TCRs, and _______
proteins, as well as various co-receptors,...