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Cajal's histological preparations and drawings about pathology. (A) Syphilitic chancre; (B) Plasma cells in connective tissue of tumor; (C) Infiltrating carcinoma of the nose; (D) Cavernous angioma of the skin; (E) Alveolar sarcoma of the nose skin; (F) Mammary gland adenocarcinoma (A1–B3,B5–F1, hematoxilyn and eosin; (B4) trichromic method). (Drawings reproduced with the permission of the Inheritors of Santiago Ramón y Cajal ©).
