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EquiFACS: The Equine Facial Action Coding System

Fig 6

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

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.

Fig 6

doi: https://doi.org/10.1371/journal.pone.0131738.g006