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Furthermore , a bone scaffold prototype with total porosity of nearly 50 % and mechanical strength of 30.2 MPa was fabricated .
 bone scaffold prototype, porosity, mechanical strength, MPa, fabricated
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:
 bone scaffold prototype, porosity, mechanical strength, MPa, fabricated