1. Department of Microbiology, Immunology and Physiology, Meharry Medical College, Nashville, TN 37208, USA.
2. Department of Cell, Molecular, and Biomedical Sciences, School of Medicine, The City College of New York, New York, NY 10031, USA.
3. School of Graduate Studies and Research, Meharry Medical College, Nashville, TN 37208, USA.