1. Department of Genetics Cell Biology and Development University of Minnesota, 6–160 Jackson Hall 321 Church Street SE Minneapolis Minnesota 55455 USA
2. Structural Acoustics Branch NASA Langley Research Center Mail Stop 463 Hampton Virginia 23681 USA
3. NASA Glenn Research Center 21000 Brookpark Road Cleveland Ohio 44135 USA
4. Department of Biochemistry Molecular Biology and Biophysics University of Minnesota 321 Church Street SE Minneapolis Minnesota 55455 USA