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In this study we show that BPA acts as a potent blocker of voltage - activated Ca ( 2 + ) channels .
 Chemical: BPA; Chemical: Ca ( 2 + )
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: BPA; Chemical: Ca ( 2 + )