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Contributor Notes
Received for publication April 13, 1979.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.
Present address: Twyford Labs. Ltd., Baltonsborough, Glastonbury, Somerset, BA6 8QG, U.K. The gift of the cytokinin PBA (SD8339) by Danish Shell is gratefully acknowledged. A. Hansen Amagertrϕ A/S is thanked for the donation of Monstera deliciosa plants.
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