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Human mesenchymal stem cell ( hMSC ) response to topographies with features of subcellular dimensions ( ~ 5 to 40 mu m ) and with various aspect ratios increasing from 1 : 1 to infinity ( e . g . , channels ) are quantified , and the dynamic nature of the culture system is demonstrated by sequentially presenting a series of topographies through in situ modifications and quantifying reversible changes in cell morphology in response to substratum topographies altered in real time .
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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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