Cells, the fundamental units of life, serve as the cornerstone for understanding the intricate biology of organisms. 

They may be used as models for drug discovery or disease modeling, enabling researchers to simulate human biological processes and assess the effects of potential pharmaceuticals in a controlled environment. Advanced cell models are pivotal in this exploration, especially in new era of regenerative medicine and personalized treatment. Stem cell therapies, engineered cell lines, and organoids are at the forefront of this innovation, offering transformative solutions for conditions previously deemed untreatable. 

Cells may on the other hand, be used as therapies themselves, and this usually involves the administration of live cells to a patient to repair or replace damaged tissues and cells. The cells used in therapy can be derived from the patient (autologous) or from a donor (allogeneic), and they may include stem cells, immune cells, or other specialized cells. The goal of cell therapy is to harness the regenerative and healing properties of cells to improve health outcomes and offer new solutions for previously untreatable conditions.