17925
To improve accuracy of the molecular mechanics ( MM ) force field ( FF ) for protein - ligand simulations , we use a protein - specific FF derived by the fragment molecular orbital ( FMO ) method and by the restrained electrostatic potential ( RESP ) method .
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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: Chemical 
Text: {0} 
 Entities:  
Answer:
 None