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Hence , most studies on inducing topographical cues were focused on two-dimensional ( 2D ) surface structures and based on imprinting and soft-lithography processes .
 two-dimensional, 2D, surface structures, processes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 two-dimensional, 2D, surface structures, processes