The following are all responses made by cells of the immune system to a pathogen.
1) mitosis
2) bind to infected cell
3) produce memory cells
4) secrete antibodies
Which of the responses is correct for $\beta - $lymphocytes?
1, 2, 3 and 4
2 )
1, 2 and 4 only
3 )
1 and 3 only
4 )
2, 3 and 4 only
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