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Responses of urinary strip preparations from control and cyclophosphamide - pretreated rats to electrical field stimulation and to agonists were assessed in the absence and presence of muscarinic , adrenergic and purinergic receptor antagonists .
 cyclophosphamide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 cyclophosphamide