Paul Erlich was the first to propose that white blood cells had some structure that could bind to antigens similar to a "lock and key."

Question

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Paul Ehrlich proposed the side-chain theory around 1897, suggesting that cells have side-chains (similar to the lock and key model) that could specifically bind to toxins or antigens, a foundational concept for the modern understanding of the immune system and antibody-antigen interactions.

Paul Erlich Was the First to Propose That White Blood