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Lateral bud outgrowth in decapitated shoots of Ipomoea nil. Auxin (0·5 % NAA in lanolin) or 1 % ABA (in lanolin) was applied apically to the cut stem surface above the highest node below the point of decapitation or basally in a ring around the stem below the node. Measurements were begun 1–2 weeks after treatment. Values given are ± s.e. n = 807.
