Page 444 - Veterinary Immunology, 10th Edition
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FIG. 15.9 The sequence of events that occurs when an antigen-
processing B cell interacts with a helper T cell. During a primary
immune response, antigen is processed by a dendritic cell and
presented to the helper T cell. During a secondary immune
response, the B cell itself can act as an antigen-presenting cell. Co-
stimulators, such as CD154 and CD28, engage serially to trigger IL-
4 secretion by the T cell and IL-4R production by the B cell.
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