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joker joker
wrote...
6 years ago
_____ 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.
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wrote...
6 years ago
d
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