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Data from Burr’s 1929 paper demonstrating the essentiality of fatty acid. The saponifiable (fatty acid) fraction of lard stimulated growth of rats when added to a fat-free diet (left set of data), but the nonsaponifiable lipids (middle set), and glycerol (right set) did not. Each line represents data from a single rat, and the time interval between data points is 4 weeks. Reprinted with permission from (1).
