Innate immune system. Physical and chemical barriers for infection. Epithelial is a first line of defense against invading organisms
Innate immune system. Physical and chemical barriers for infection. Epithelial is a first line of defense against invading organisms. blood-brain barrier protects the nervous system from pathogens into humans body
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Photo credit: © Tetiana Zhabska / Alamy / Afripics
License: Royalty Free
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