Weill Cornell Medicine Oct 14 2025 Scientists have discovered a method to induce human endothelial cells from a small biopsy sample to multiply in the laboratory, producing more than enough cells to replace damaged blood vessels or nourish organs for transplantation, according to a preclinical study by Weill Cornell Medicine investigators. Endothelial cells form the inner lining of blood vessels and regulate blood flow, inflammation and healing. Traditional approaches for growing these cells in