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Live , on - chip tracing of embryonic stem cell differentiation and endothelial cell tubulogenesis confirms that the platform can be used to both create communities of discrete 3D microenvironments as well as to locally monitor subsequent divergent responses at both single cell and multi - cell scales .
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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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