Fig. 3

Characters used to describe and classify nanostructures. Schematic representation of the four characters used in this study: (a) cell shape (alternative states: ‘polygonal’ or ‘wide’); (b) cell border (‘regular’ or ‘digits’ or ‘sawteeth’); (c) cell surface (‘smooth’ or ‘holes’ or ‘straight channels’ or ‘labyrinthine channels’); and (d) ridges (‘present’ or ‘absent’). Abbreviations: cr, cranial; ca, caudal; dl, digit lenth; cl, cell length