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    Image of ulcer, erosion in the ear from a male Swiss CD-1 mouse in a chronic study
    Ear - Ulcer in a male Swiss CD-1 mouse from a chronic study. An ulcer of the external ear canal epithelium; necrotic debris and neutrophils cover much of the ulcer (arrow).
    Image of ulcer, erosion in the ear from a male Swiss CD-1 mouse in a chronic study
    Ear - Ulcer in a male Swiss CD-1 mouse from a chronic study (higher magnification of Figure 1). There is an ulcer (arrow) of the external ear canal epithelium.
    Image of ulcer, erosion in the ear from a male Swiss CD-1 mouse in a chronic study
    Ear - Ulcer in a male Swiss CD-1 mouse from a chronic study (higher magnification of Figure 1). There is an ulcer (arrow) of the external ear canal epithelium; the adjacent epithelium is hyperplastic.