Evolution of immunity in invertebrates
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It was already known that phagocytosis occurred in specialized mammal cells but never in something less complex like a starfishThis discovery led him to understand that phagocytosis played a much broader role, it was a fundamental mechanism of protection in the animal kingdomMetchnikoff's further studies showed that the host defense system of all animals today were present millions of years before when hey were just beginning to evolveHis studies opened up the new field of comparative immunologyComparative immunologists studied the immune defenses of past and current creaturesThey gained further insight into how immunity works
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