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. 2014 Jan 21;9(1):e86205. doi: 10.1371/journal.pone.0086205

Figure 1. Schematic of the endoskeletal structure of the shark pectoral fin.

Figure 1

The radial number and segment number of this pectoral fin are 13 and 4, respectively (see the text for details). ms, mesopterygium; mt, metapterygium; pt, protopterygium; rd, radial.