2031
We applied multiple layers of gelatin- and chitosan-based coatings containing either bone morphogenetic protein ( BMP ) -2 or vancomycin on the surface of selective laser melted porous structures made from commercial pure Titanium ( CP Ti ) and designed using a triply periodic minimal surface ( i.e. , sheet gyroid ) .
 coatings, bone, surface, selective laser melted, porous, Titanium, Ti, designed, triply periodic minimal surface, sheet
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:
 coatings, bone, surface, selective laser melted, porous, Titanium, Ti, designed, triply periodic minimal surface, sheet