Papillary%20mass,%20composed%20by%20one%20layer%20of%20cubic%20mesothelial%20cells,%20supported%20by%20a%20low%20cellular%20fibrovascular%20stroma%20in%20lungs%20of%20a%20lion%20with%20mesothelioma.%20HE,%20bar%20=%20200%EF%BF%BD%EF%BF%BDm%20(Rocha%20et%20al.,%20p.%20417).
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