9275
Multi - walled carbon nanotube increases the excitability of hippocampal CA1 neurons through inhibition of potassium channels in rat ' s brain slices .
 Chemical: carbon; Chemical: potassium
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: carbon; Chemical: potassium