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The production of reactive oxygen species ( ROS ) and changes in mitochondrial membrane potential ( Delta Psi m ) in cells exposed to Epo A , Epo B and PTX were studied using specific fluorescence probes , DCFH ( 2 ) - DA ( 2 ' , 7 ' - dichlorodihydrofluorescein diacetate ) and JC - 1 ( 5 , 5 ' , 6 , 6 ' - tetrachloro - 1 , 1 ' , 3 , 3 ' - tetraethylbenzimidazolcarbocyanine ) .
 Chemical: oxygen; Chemical: Epo A; Chemical: Epo B; Chemical: PTX; Chemical: DCFH ( 2 ) - DA; Chemical: 2 ' , 7 ' - dichlorodihydrofluorescein diacetate; Chemical: JC - 1; Chemical: 5 , 5 ' , 6 , 6 ' - tetrachloro - 1 , 1 ' , 3 , 3 ' - tetraethylbenzimidazolcarbocyanine
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: oxygen; Chemical: Epo A; Chemical: Epo B; Chemical: PTX; Chemical: DCFH ( 2 ) - DA; Chemical: 2 ' , 7 ' - dichlorodihydrofluorescein diacetate; Chemical: JC - 1; Chemical: 5 , 5 ' , 6 , 6 ' - tetrachloro - 1 , 1 ' , 3 , 3 ' - tetraethylbenzimidazolcarbocyanine