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a Rat with normal incisors; b loss of both upper incisors and new growth. Enormous elongation of the lower incisors and pressure ulcer of the hard palate. Witte spot (asterisk) on the front side of both lower incisors. c Loss of both lower incisors. Ulcer of the mandible with visible new growth of lower incisors. Abnormal extension of both upper incisors and white spot (asterisk) on the front side of both incisors [15]. Courtesy of the library University of Nijmegen
