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The onlays were design to facilitate the diffusion of cells and nutrients from high bone metabolic to low bone metabolic areas .
 application: onlays; engineering feature: design; concept or principle: diffusion; application: cells; biomedical: bone; process characterization: bone metabolic areas
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: 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:
 application: onlays; engineering feature: design; concept or principle: diffusion; application: cells; biomedical: bone; process characterization: bone metabolic areas