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Traditional three-dimensional ( 3D ) bioprinting techniques of reactive materials usually include a mixing step of reactive agents prior to deposition , leading to potential changes in the rheological and biocompatibility properties of the resulting ink .
 concept or principle: three-dimensional; concept or principle: 3D; application: bioprinting; material: reactive materials; concept or principle: mixing; concept or principle: deposition; machanical property: rheological; machanical property: biocompatibility; material: ink
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: three-dimensional, 3D, bioprinting, reactive materials, mixing, deposition, rheological, biocompatibility, ink 
Answer:
 concept or principle: three-dimensional; concept or principle: 3D; application: bioprinting; material: reactive materials; concept or principle: mixing; concept or principle: deposition; machanical property: rheological; machanical property: biocompatibility; material: ink