Some of the events during the primary immune response are listed.
1. phagocytosis of a foreign microbe by a macrophage and antigen presentation
2. some T-lymphocytes will become T-killer cells which kill infected body cells
3. the T-helper cell divides by mitosis to produce T-lymphocyte clones
4. a T-helper cell with the complementary receptor binds to the antigens being presented
What is the correct sequence of events during the primary immune response?
1 )
$4 \to 1 \to 3 \to 2$
$1 \to 4 \to 3 \to 2$
3 )
$3 \to 1 \to 4 \to 2$
4 )
$3 \to 4 \to 1 \to 2$
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