_____ in the switch regions positioned 5? to each heavy-chain C gene is induced by _____
a. Somatic hypermutation; TI antigens
b. Chromatin remodeling; B-cell co-receptor signaling
c. Recombination; survival signals received from follicular dendritic cells
d. Transcription; helper T-cell cytokines
e. Gene repression; apoptotic signals received from tingible body macrophages.
d
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