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Electron micrographs of Descemet's membrane of Wistar (a), (b), (c) and GK (d), (e), (f) rat corneas at 15 (a), (d), 33 (b), (e), and 62 (c), (f) weeks. Long-spacing collagen (arrowheads) accumulates with increasing age. Dm: Descemet's membrane; En: endothelium; S: stroma. Scale bar: 500 nm.
