1. Department of Biology; Texas A&M University; College Station Texas 77843-3258 USA
2. Microscopy and Imaging Center; Texas A&M University; College Station Texas 77843-2257 USA
3. Department of Biochemistry and Biophysics; Texas A&M University; College Station Texas 77843-2128 USA
4. Center for Phage Technology; Texas A&M University; College Station Texas 77843-2128 USA