RT Journal Article SR Electronic T1 Cell-wall defective variants of Treponema pallidum. JF The British Journal of Venereal Diseases JO Br J Vener Dis FD BMJ Publishing Group Ltd SP 227 OP 238 DO 10.1136/sti.49.3.227 VO 49 IS 3 A1 Rodrigues, M M YR 1973 UL http://sti.bmj.com/content/49/3/227.abstract AB