7651
Neuroprotective effects of oxymatrine against excitotoxicity partially through down - regulation of NR2B - containing NMDA receptors .
 Chemical: oxymatrine; Chemical: NMDA
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: oxymatrine, NMDA 
Answer:
 Chemical: oxymatrine; Chemical: NMDA