Figure 4 of Zhang, Mol Vis 2012; 18:348-361.

Figure 4. Representative confocal slices of Z-series, showing bone microporosities in chicken scleral ossicles. The bone microporosities became visible by E15 (arrow) and their numbers increase for a given field of view with increasing development of the ossicle plate (E15 to E21). Scale bar: 50 µm.