1541
Some research define organ printing as a rapid prototyping computer-aided 3D printing technology based on using layer-by-layer deposition of cell and/or cell aggregates into a 3D gel with sequential maturation of the printed construct into perfused and vascularised living tissue or organ .
 concept or principle: research; manufacturing process: organ printing; material: as; enabling technology: rapid prototyping; enabling technology: 3D printing technology; concept or principle: layer-by-layer deposition; application: cell; application: cell; material: aggregates; material: 3D gel; concept or principle: printed construct
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:
 concept or principle: research; manufacturing process: organ printing; material: as; enabling technology: rapid prototyping; enabling technology: 3D printing technology; concept or principle: layer-by-layer deposition; application: cell; application: cell; material: aggregates; material: 3D gel; concept or principle: printed construct