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Efforts to understand the physical nature of complex coacervates are important for developing robust adhesives , injectable materials , or novel drug delivery vehicles for biomedical applications ; however , their internal fluidity necessitates the use of in situ characterization strategies of their local dynamic properties , capabilities not offered by conventional techniques such as X - ray scattering , microscopy , or bulk rheological measurements .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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