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. 2015 Aug 5;10(8):e0131738. doi: 10.1371/journal.pone.0131738

Fig 6. The location and direction of movement in AU113, sharp lip puller (indicated by the arrow).

Fig 6

The lips are in the neutral position. AU113 is very difficult to code from photographs unless there is a very strong action, or it is combined with AU12, lip corner puller.