RT Journal Article SR Electronic T1 Biology of the Treponematoses JF The British Journal of Venereal Diseases JO Br J Vener Dis FD BMJ Publishing Group Ltd SP 199 OP 199 DO 10.1136/sti.33.3.199 VO 33 IS 3 A1 I.N.O.P. YR 1957 UL http://sti.bmj.com/content/33/3/199.abstract AB