510
Scaffolds with smaller pores are considered to have larger surface area and therefore more space for bone tissue ingrowth .
 engineering feature: Scaffolds; machanical property: pores; process parameter: surface area; concept or principle: bone tissue ingrowth
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:
 engineering feature: Scaffolds; machanical property: pores; process parameter: surface area; concept or principle: bone tissue ingrowth