We would like to thank Drs. Phillip John SanMiguel (Director of the Genomics Core Facility, Purdue University), Jeff Bennetzen (Purdue University) and Jo Messing (Rutgers University), for donating unpublished maize transposable element sequences to the Gramineae Repeat Database and Zea Repeat Database.

Funding for this work was provided by a grant to C. Robin Buell from the U. S. Department of Agriculture (99-35317-8275), the National Science Foundation (DBI-998282), and the U. S. Department of Energy (DE-FG02-99ER20357; DE-FG02-01ER15265).

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