19626
Analysis of adhesion , morphology , cytoskeletal organization , and motility of the cells on the PEMUs revealed that A7r5 cells established a polarized orientation toward increasing modulus on shallow modulus gradients ( approximately 4 . 7 MPa mm ( - 1 ) ) and durotaxed toward stiffer regions on steeper gradients ( approximately 55 MPa mm ( - 1 ) ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None