1. Introduction 2. Crosslinking Enzymes and Their Roles in Biochemistry 3. Structure - Function Relationships of Transglutaminases 4. Transglutaminases from Animal Sources 5. Transglutaminases from Plant Sources 6. Transglutaminases from Microorganisms 7. Transglutaminase in health and disease 8. Human Transglutaminase and Its Role in Forming Skin and Bone 9. Transglutaminases in Drug Development 10. Transglutaminase in tissue engineering and other regenerative biomedicine 11. Inhibitors and Inhibition of Transglutaminases 12. Transglutaminases in Meat and Seafood Bioprocessing 13. Transglutaminase in Dairy Bioprocessing 14. Transglutaminase in Noodles, Pastas and Baked products 15. Transglutaminase in Meat Analogues and Cell Meat 16. Transglutaminase in Synthesis of Materials and Polymers 17. Transglutaminase in textile, wool, silk, and leather processing 18. Newly Engineered Transglutaminases 19. Immobilization of Transglutaminases and Transglutaminase as immobilization agent 20. Research Protocols for Transglutaminases 21. Industrial Production and Commercialization of Transglutaminases