The idea that complex biological systems can evolve through a series of simple, random events is not universally accepted. The structure of a vital immune protein shows how such evolution can occur at a molecular level.
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Liddington, R., Bankston, L. Origins of chemical biodefence. Nature 437, 484–485 (2005). https://doi.org/10.1038/437484a
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DOI: https://doi.org/10.1038/437484a