6351
Pharmacological and biophysical analysis of R - type Ca ( 2 + ) channels revealed that BPA interacts with the extracellular part of the channel protein .
 Chemical: Ca ( 2 + ); Chemical: BPA
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: Ca ( 2 + ); Chemical: BPA