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. 2015 Mar 18;10(3):e0119879. doi: 10.1371/journal.pone.0119879

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© 2015 Schwalbe, Schreiber

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 1 — V3 loop regions of the three viruses NL-952.1, NL-952.2 and NL-952.3 which differ by mutations affecting the N-glycosylation sites g13-g17. The three viruses were used to generate mutants with all triple combinations of amino acids R and K at the V3 loop positions 9, 10 and 11 (black symbols). N-linked carbohydrates: C, complex type; HM, high mannose type.