This text advances fundamental knowledge in modeling in vitro tissues/organs as an alternative to 2D cell culture and animal testing. Prior to engineering in vitro tissues/organs,the descriptions of prerequisites (from pre-processing to post-processing) in modeling in vitro tissues/organs are discussed. The most prevalent technologies that have been widely used for establishing the in vitro tissue/organ models are also described, including transwell, cell spheroids/sheets, organoids, and microfluidic-based chips. In particular, the authors focus on 3D bioprinting in vitro tissue/organ models using tissue-specific bioinks. Several representative bioprinting methods and conventional bioinks are introduced. As a bioink source, decellularized extracellular matrix (dECM) are importantly covered, including decellularization methods, evaluation methods for demonstrating successful decellularization, and material safety. Taken together, the authors delineate various application examples of 3Dbioprinted in vitro tissue/organ models especially using dECM bioinks. 

Introduction

Definition, necessity, and prerequisites for modeling  3D tissues and organs
Prevalent technologies for in vitro tissue/organ biofabrication
3D cell printing techniques
Decellularized extracellular matrix-based bioinks
Skin
Blood vessels
Liver
Kidney
Cardiac
Airway
Brain
Muscle
Conclusion and future perspective