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Lipmann here raised the question of whether evolutionary changes were chance events or were produced by biochemical mechanisms. Lipmann cited as an example for the latter the symbiosis of microorganisms, as in the phagocytosis (the engulfing) of bacteria by primitive cells.
Original Repository:
The Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers
Original Repository. Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers. 11646. URL. http://archives.wellcome.ac.uk/