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Open cellular structures fabricated in Ti6Al4V using the electron beam melting ( EBM ) process have been proposed for tissue scaffolds and low stiffness implants that approximate the properties of bone .
 engineering feature: cellular structures; material: Ti6Al4V; manufacturing process: electron beam melting; manufacturing process: EBM; concept or principle: process; engineering feature: scaffolds; machanical property: stiffness; application: implants; concept or principle: properties; biomedical: bone
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: cellular structures, Ti6Al4V, electron beam melting, EBM, process, scaffolds, stiffness, implants, properties, bone 
Answer:
 engineering feature: cellular structures; material: Ti6Al4V; manufacturing process: electron beam melting; manufacturing process: EBM; concept or principle: process; engineering feature: scaffolds; machanical property: stiffness; application: implants; concept or principle: properties; biomedical: bone