AU4 muscle – corrugator supercilii, depressor glabellae, depressor supercilii – FACS – Facial Action Coding System

AU4 muscle - corrugator supercilii, depressor glabellae, depressor supercilii

AU4 muscle – corrugator supercilii, depressor glabellae, depressor supercilii – FACS – Facial Action Coding System

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