During a primary immune response, the following events occur.
1) Some B-lymphocytes form plasma cells.
2) B-lymphocytes with the specific cell surface receptors divide repeatedly by mitosis.
3) Specific antibody is produced.
4) T-helper cells secrete cytokines.
5) T-helper cells identify a specific antigen.
In which order will the events occur?
1 )
2 → 1 → 4 → 3 → 5
2 )
2 → 4 → 3 → 1 → 5
5 → 4 → 2 → 1 → 3
4 )
5 → 4 → 3 → 1 → 2
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