2155
In the current study , we test two hypotheses : ( 1 ) the cardiac compensatory changes in response to air pollution are dependent on its composition and ( 2 ) specific cardiac adaptations are regulated by atrial natriuretic peptide ( ANP ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None