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SummaryThe amino acid sequence of mung bean and sunflower cytochromes c have been determined on 3 y moles of pure cytochrome by using a combination of high voltage paper electrophoresis and sequence analysis by the Dansyl/Edman method. These data have been compared with the wheat germ cytochrome c sequence. If the present potential of the method continues to be realised it is hoped to establish the major branches of a phylogenetic tree for the plant kingdom in the future.