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In page John Postgate (microbiologist):

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Postgate was a member of the Postgate family, and is not to be confused with his grandfather John Percival Postgate (1853–1926), professor of Latin at the University of Liverpool and author of school textbooks and editions of Latin poetry, nor with his great-grandfather John Postgate (1820–1881), a surgeon who became Professor of Medical Jurisprudence and Toxicology at Queen's College, Birmingham (a predecessor college of the University of Birmingham) and was a leading campaigner against food adulteration.[7]