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In BEAS - 2B cells and primary airway epithelia , roflumilast interacted with formoterol in a positive cooperative manner to enhance the expression of several glucocorticoid - inducible genes that have anti - inflammatory potential .
 Chemical: roflumilast; Chemical: formoterol
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: roflumilast; Chemical: formoterol