263
Anion to cation selectivity ratio determined from the relative rates of reaction of MTSES - and MTSET + with the water exposed residues in the M6 segment .
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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:
 None