File:W. Simpson, R. Ross, Aldo Castellani and Malcolm Watson 1930.jpg
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![File:W. Simpson, R. Ross, Aldo Castellani and Malcolm Watson 1930.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/bb/W._Simpson%2C_R._Ross%2C_Aldo_Castellani_and_Malcolm_Watson_1930.jpg/670px-W._Simpson%2C_R._Ross%2C_Aldo_Castellani_and_Malcolm_Watson_1930.jpg?20140602020332)
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