Gene rearrangement of cytotoxic T cells occurs primarily in which of the following? a. Bone marrow b. Spleen c. Germinal centers d. Thymus e. Mesenteric lymph nodes Gene products of class II major histocompatibility complex (MHC) present antigenic peptides primarily to which of the following? a. Helper T cells b. Cytotoxic T cells c. Antigen-presenting cells d. B cells e. Plasma cells
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