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This hypothesized mechanism of action is also supported by the fact that various other receptor types , also positively coupled to cAMP , in the iris cause relaxation of the sphincter muscle [ 1 , 28 ] .
 Anatomy: iris; Anatomy: sphincter muscle
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: iris; Anatomy: sphincter muscle