Taneja NK, Ganguly T, Bakaletz LO, Nelson KJ, Dubey P, Poole LB, Deora R. D-alanine modification of a protease-susceptible outer membrane component by the Bordetella pertussis dra locus promotes resistance to antimicrobial peptides and polymorphonuclear leukocyte-mediated killing. J Bacteriol. 2013 Nov; 195(22):5102-11.