How the immune system works by Lauren M Sompayrac pdf free download. Any invader that breaches the physical barrier of skin or mucosa is greeted by the innate immune system – our second line of defense. Immunologists call this system “innate” because it is a defense that all animals just naturally seem to have. Indeed, some of the weapons of the innate immune system have been around for more than 500 million years. Let me give you an example of how this amazing innate system works.
How the immune system works by Lauren M Sompayrac pdf free download
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