Variation of the homopolymeric cytosine (polyC) tract in the Cpn 1054 gene family in C. pneumoniae. In each panel the vertical axis indicates the number of individual clones with a specific length of polyC. The horizontal axis indicates the number of cytosines within an individual polyC tract. (A) Intrastrain variation of the length of the polyC tracts of Cpn 043, 1054,1055 within strain AR39. (B) Variation of the length of the polyC tract in Cpn 1055 within AR39, AR 458 and PS32. (C) The variation of the length of the poly C tract within Cpn 1055 of AR39 identified in recombinant clones using Taq and Pwo DNA polymerases.