White Blood Cells Rip Holes in Blood Vessels

White Blood Cells Rip Holes in Blood Vessels
University of Pittsburgh, Center for Biologic Imaging via AP

White blood cells are constantly tearing holes in your blood vessel walls. But these guardians of the immune system are doing it to protect you: Once they ride through the bloodstream to infected tissues—where they make antibodies and eat foreign invaders—they need a way to get inside.

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