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Text File  |  1999-11-09  |  319b  |  10 lines
  1. Which of the following events must happen first? B
  2. clonal expansion of a T cell
  3. macrophage presents an antigen to a T cell
  4. T cells divide and differentiate into helper T cells
  5. T cells divide and differentiate into memory T cells
  6. T cells divide and differentiate into cytotoxic T cells
  7.  
  8. [#FRAME:"TRM4S8E"]
  9. NONE
  10.