Lymphocyte activation can occur in several ways. However, in all cases
A. lymphocytes must recognize an antigen.
B. helper T cells are activated first and they then stimulate other cells.
C. antigen-presenting cells process the antigen and present it to the lymphocytes.
D. cytokines released by the antigen stimulate the lymphocyte response.
E. antigens must be able to recognize the lymphocytes.
A
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