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. 2018 Apr 23;8:121. doi: 10.3389/fcimb.2018.00121

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Copyright © 2018 Clemens, Lee and Horwitz.

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 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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CryoEM density map of the contracted F. novicida T6SS sheath. Surface view (left) and cut-away view (right). Prominent left-handed 6-start helices formed by surface ridges are apparent. Colored by radius, innermost colored brown and outermost colored blue. Reproduced with permission from (Clemens et al., 2015).