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Contributor Notes
Tissue Culture and Molecular Genetics Laboratory, Plant Physiology Institute.
Received for publication Nov. 4, 1982. Mention of a trademark, proprietary product, or vendor does not constitute a guarantee or warranty of the product by the U.S. Department of Agriculture, and does not imply its approval to the exclusion of other products or vendors that may also be suitable. The author expresses appreciation to Robert Gries-bach and to Karen Harris for their assistance with plant root tip smears, to Perry Cregan for assistance with statistical analysis of data, and to Paula Dunn for her valuable technical assistance. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
