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In 1859 , while still a student , Mauthner described a fibrous structure in the spinal cord of fishes that contained two large cell bodies in the animals ' metencephalon .
 person: Mauthner
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Mauthner 
Answer:
 person: Mauthner