Immune system cells use damaging proteases and reactive oxygen species to destroy foreign invaders. The immune system cells are not harmed because the microbes(微生物) are sequestered(隔离) in vesicles(囊泡). How did the invaders get to the vesicles?
A.
Active transport
B.
Phagocytosis
C.
Exocytosis
D.
Pinocytosis
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