Abstract
Abstract Cytokinins were extracted from lettuce leaves (Lactuca sativa L., butterhead type), purified by cation exchange, paper and Sephadex LH-20 column chromatography and bioassayed with tobacco callus. Compounds with chromatographic mobilities corresponding to those of zeatin and zeatin riboside were detected. The inner, developing leaves of the heads contained most of the cytokinin activity.
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