This lecture covers soft tissue engineering using physically self-assembling injectable materials, including background on volume replacement, regenerative medicine, current cell transplantation techniques, success factors, 3D scaffolds, and more. It also delves into the role of stability, cell attachment, and delivery methods, with insights on in-vivo colonization, shaping, and tissue matching. The presentation concludes with discussions on numerical simulations, cell therapy for Parkinson's disease, and the commercialization process, emphasizing the importance of technology, need identification, and regulatory considerations.