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Behaviors of rat aortic smooth muscle ( A7r5 ) and human osteosarcoma ( U2OS ) cells on photo - cross - linked polyelectrolyte multilayers ( PEMUs ) with uniform , or gradients of , moduli were investigated .
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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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