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. 2019 Jul 24;14(7):e0220054. doi: 10.1371/journal.pone.0220054

Fig 1. Scanning electron micrographs showing eggshell surface, cross-section, cuticle layer, and cuticle nanospheres of chicken (C), turkey (T), quail (Q), duck (D), goose (G), and ostrich (O).

Fig 1

Cross-sections revealed that the shell was divided into a mammillary layer (ML), palisade layer (PL), and cuticle layer (CL).