The method is based on the “embryonic organ niche method” developed by the Tokyo Jikei Medical University and others. In this method, human cells are implanted at the organ development site (organ niche) of a baby pig and grown to a normal organ. Nephron precursor cells made from human iPS cells which have differentiated into glomeruli and proximal and distal tubules are injected into the fetal kidney of a genetically modified porcine fetus. The kidney primordia is then transplanted into a patient to promote the maturation of human kidney function. The program is in collaboration with Meiji University which will develop genetically modified pigs, and Bios, a startup company which has succeeded in animal experiments to regenerate functional mature kidneys using the the embryonic organ niche method

Dainippon Sumitomo news release, April 5, 2019