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. 2013 Sep;87(18):10016–10024. doi: 10.1128/JVI.01129-13

Fig 2.

Fig 2

Comparison of loops in NA from different influenza viruses. (A) Superposition of NA monomers with an emphasis on the 270-loop, 380-loop, and 430-loop. NAs are differentiated by color: 18N1, green; VN04N1, cyan; 09N1, red, N4, light magenta; N5, light pink; N8, salmon; Tokyo N2, white; N6, orange; N9, light blue; and N3, yellow. (B) Stereo view of the 270-loop. All group 1 members are on the left, while group 2 members are on the right. N3 is in the middle with a longer 270-loop. (C) Ribbon representation of the 380-loop. The 380-loop of N3 is also unique compared to all other NAs. (D) Stereo image of the 430-loop. N3 also has a relative flexible 430-loop.