1. Department of Biochemistry, University of Washington, Seattle, Washington 98195, College of Forest Resource, University of Washington, Seattle, Washington 98195, Memorial University of Newfoundland, St. John's, Newfoundland, A1B IT8 Canada, Occidental Chemical, Grand Island, New York, 14072, and Washington State University, Puyallup Research and Extension Center, Puyallup, Washington 98371