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Different labels Cajal attached to his histological preparations during his life. (A) 1877–1884, when Cajal was in Zaragoza; (B), 1884–1897, when Cajal was in Valencia; (C) between 1887–1892 when he was in Barcelona; (D–H) from 1892 to 1920, Madrid; (I–K) approximately belong to the period after 1920; (L) from 1887, when he started to study neoplasias; (M–O) labels found in many histological slides probably from when he moved to Madrid until the end of his career.
