19808
Contribution of the m1 transmembrane helix and pre - m1 region to positive allosteric modulation and gating of N - methyl - d - aspartate receptors .
 Chemical: N - methyl - d - aspartate
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: N - methyl - d - aspartate 
Answer:
 Chemical: N - methyl - d - aspartate