Immunogenicity and protective efficacy of DNA vaccines encoding secreted and non-secreted forms of Mycobacterium tuberculosis Ag85A., Baldwin, S L., D'Souza C D., Orme I M., Liu M A., Huygen K, Denis O, Tang A, Zhu L, Montgomery D, and Ulmer J B. , Tuber Lung Dis, 1999, Volume 79, Issue 4, Number 259, p.251-9, (1999)