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Comparison of the head and internal soft-tissue anatomy of the cave-dwelling P. anguinus with A. mexicanum in larval and adult specimens. Images in the first row show 3D renderings of the head with skin in dorsal view. The second row shows color-coded segmented brain, cartilage, bones, and eyes with optic nerve and olfactory epithelium. The third row shows these structures without bone and cartilage for better clarity.
