David Chilton Phillips, Baron Phillips of Ellesmere, (7 March 1924 – 23 February 1999) was a pioneering structural biologist and an influential figure in science and government.

Phillips was the first person to determine in atomic detail the structure of the enzyme lysozyme, which he did in the Davy Faraday Research Laboratories of the Royal Institution in London in 1965.

Lysozyme, which was discovered in 1922 by Alexander Fleming, is found in teardrops, nasal mucus, gastric secretions and egg white. Lysozyme exhibits some antibacterial activity so that the discovery of its structure and mode of action were key scientific objectives.

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