Chinese scientists have successfully grown humanized kidneys inside pig embryos, marking a significant milestone for organ transplantation. Breakthrough in xenotransplantation: Detailed in a study published in journal Cell Stem Cell on Sept. 7, the remarkable achievement represents the first time a solid humanized organ has been cultivated within another species, offering a potential solution to the critical shortage of donor organs for transplantation. The researchers, led by Liangxue Lai from the Guangzhou Institutes of Biomedicine and Health in China, reportedly took five years to overcome the challenges of interspecies organ generation.