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Morphogenesis of the hereditary microphthalmia in a new strain of rat

Morphogenesis of the eye was studied in a new strain of micro‐phthalmic rat. Abnormalities were noted immediately after the formation of the optic cup. The inner layer in the central part of the optic cup was relatively thick and contained many mitotic figures, whereas that of the marginal part was thin and contained only a few. The transitional point in the inner layer between the central and the marginal parts was well marked. This is evidently due to the extreme growth inhibition of the inner layer at the marginal part.