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We found that chronic arsenic exposure at these low doses slows wound repair and reduces ATP - mediated Ca ( 2 + ) signaling .
 Chemical: arsenic; Chemical: ATP; 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: arsenic; Chemical: ATP; Chemical: Ca ( 2 + )