- Attenuation of virulence by disruption of the Mycobacterium tuberculosis erp gene. Berthet, F.X., Lagranderie, M., Gounon, P., Laurent-Winter, C., Ensergueix, D., Chavarot, P., Thouron, F., Maranghi, E., Pelicic, V., Portnoï, D., Marchal, G., Gicquel, B. Science (1998)