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Occurrence of m1G37 was further investigated in an analysis of the substrate properties of in vitro transcripts of human mt - tRNAProtowards pure Escherichia coli methylguanosine transferase .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
 Entities:  
Answer:
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