To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S1. Small-spotted catshark, hatchling (103 mm) whole XCT scan rotation, showing the skin denticles covering the entire body. Sox2+ progenitors in sharks link taste development with the evolution of regenerative teeth from denticles Kyle J. Martin, Liam J. Rasch, Rory L. Cooper, Brian D. Metscher, Zerina Johanson, and Gareth J. Fraser PNAS. 2016. 113:14769-14774 DOI: 10.1073/pnas.1612354113 Download Original Video Browse All Videos »