Nichols, D., Lewis, K., Orjala, J., Mo, S., Ortenberg, R., O’Connor, P., Zhao, C., Vouros, P., Kaeberlein, T. and Epstein, S.S. (2008) Short peptide induces an “uncultivable” microorganism to grow in Vitro. Applied and Environmental Microbiology, 74, 4889-4897.