This article provides a comprehensive overview of stem cells, tracing their journey from fundamental biology to applications in regenerative medicine. Defined by their abilities for self-renewal and differentiation, stem cells play critical roles in embryonic development, tissue maintenance, and repair. The article categorizes stem cells based on their potency—totipotent, pluripotent, multipotent, oligopotent, and unipotent—and explores their distinct biological functions. A major breakthrough in the field was the development of induced pluripotent stem cells (iPSCs), which enable personalized medicine by reprogramming adult somatic cells into pluripotent ones. The article further discusses clinical applications of stem cell therapy, including the use of mesenchymal stem cells (MSCs) in treating osteoarthritis, myocardial infarction, and Crohn’s disease, and hematopoietic stem cell transplantation for hematological disorders. Tissue engineering, which combines stem cells with biomaterials, expands the potential of regenerative therapies. In parallel, stem cell-derived organoids provide physiologically relevant in vitro models for disease modeling, drug screening, and developmental studies. Despite challenges such as tumorigenicity, immune rejection, and ethical concerns, stem cells remain a cornerstone in advancing precision medicine and therapeutic innovation.
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