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. 2018 Jul 31;9:1779. doi: 10.3389/fmicb.2018.01779

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Copyright © 2018 Santoro, Romeo, Pozzi and Iannelli.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The composite integrative conjugative element (ICE) Tn5253 contains two distinct genetic elements integrated: (i) Tn5251 which carries tet(M) and is able to transfer by conjugation autonomously; (ii) Ωcat(pC194) which contains cat, is not conjugative, but is capable of intracellular transposition. Two sets of xis/int recombinase genes are carried by Tn5253, one set (orf78/orf79) is at the right end of the element, while the other (orf21/orf22) belongs to Tn5251. ORFs and their transcription direction are indicated as arrows, sequences corresponding to Tn5251 and Ωcat(pC194) are indicated by solid bars.