300
When the activity induced by small molecule positive allosteric modulators of mGlu ( 4 ) is assessed , the potentiated signaling of mGlu ( 4 ) is further biased by histamine toward calcium - dependent pathways .
 Chemical: histamine; Chemical: calcium
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: histamine, calcium 
Answer:
 Chemical: histamine; Chemical: calcium