1. Division of Plant Sciences Univ. of Missouri Columbia MO 65211 USA
2. Environmental Molecular Sciences Laboratory Pacific Northwest National Laboratory Richland WA 99354 USA
3. Dep. of Biology & Geology Univ. of South Carolina Aiken SC 29801 USA
4. Edisto Research & Education Center Clemson Univ. Blackville SC 29817 USA
5. Division of Biochemistry Univ. of Missouri Columbia MO 65211 USA