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(A) Lateral view (above) and medial view (below) images. (B) Schematic of the pectoral fin muscle systems. co, coracoid; dpe 1, anterior component of the depressor pectoralis; dpe 2, posterior component of the depressor pectoralis; lpe, levator pectoralis; ms, mesopterygium; mt, metapterygium; pt, protopterygium.
