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CMZ in vertebrates. The CMZ is progressively reduced in higher vertebrates. The adult eye of different vertebrates (frogs and fish (a), avians (b), and mammals (c)) is shown in blue and represents the neural retina of embryonic origin, which lacks the continuous renewal ability of the CMZ, which is shown in yellow. CMZ: ciliary marginal zone. Copyright 2004. Modified with permission from UBC Press [27].
