11457
In the study of the pharmacokinetics , a higher concentration of IFN - alpha 2a was shown in the plasma of mice treated with IFN - alpha 2a - incorporated hydrogels after 4h post injection , with a much higher amount of IFN - alpha 2a delivered at the tumor tissue comparing to that of injecting an IFN - alpha 2a solution .
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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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