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The parametric effects of solids loading , polycaprolactone ( PCL ) polymer addition , and designed porosity on starch-HA composite scaffolds were measured via mechanical strength , microstructure , and in vitro biocompatibility utilizing human osteoblast cells .
 PCL, polymer, designed, composite, mechanical strength, microstructure, biocompatibility, osteoblast cells
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:
 PCL, polymer, designed, composite, mechanical strength, microstructure, biocompatibility, osteoblast cells