7291
Upon the application of higher co - ion concentrations or co - ions of higher valence in the donor formulation , the release from the fibers was enhanced , but the iontophoretic steady - state flux was decreased .
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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:
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