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Transmission electron microscopy of central/peripheral cornea in rge and control birds at 3 months post-hatch. Proteoglycans (arrows) appear as dark filaments that become longer and thicker in the deepest stromal layers. Epithelial cells and endothelium (e)/Descemet’s membrane (D) are also shown. Approximate corneal depth is indicated in the central panel by histology (haematoxylin and eosine stain). Scale bars: 0.1 μm (stroma), 2.5 μm (endoth/Desc), 5 μm (epith).
