Figure 9 of Zhang, Mol Vis 2012; 18:348-361.

Figure 9. Quantification of the mineralization of chicken ossicles. Data were derived from the interior region of each ossicle, as viewed in cross-section (Figure 7) A: Patterns of C and O in chicken ossicles during development; B: Patterns of Ca and P in chicken ossicles during development; C: C/O and Ca/P ratios in chicken ossicles during development. Crosshatch gaps (//) are shown between the E21 and 1 week ages, and between the older ages to emphasize that the time scales in these 3 regions are not a linear continuous line.