Properties of putative conjugative and mobilizable transposons in C. difficile.

Tc: tetracycline, Erm: erythromycin, S: sensitive, R: resistant. Genome excision ND = not determined, NA = not available. σ: standard deviation.† = Sequence of the element was not joined in assembled genome, size and G+C percentage are estimates. The sequences of novel circular intermediates were deposited in Genbank with the accession numbers given. Transfer frequency is calculated as the number of transconjugant cells per donor cell. Two transfer frequencies are reported for CTn1 marked with the Clostron in two different genes, CD0364 and CD0386, respectively.