P.B. is supported by the German Research Foundation (DFG, Project IDs 322900939, 445703531 and INST 222/1582-1), European Research Council (ERC Consolidator Grant No. 101001791), Federal Ministry of Research, Technology, and Space (BMFTR, 01KX2524 to P.B. and R.H.) and the Innovation Fund of the Federal Joint Committee (Transplant.KI, No. 01VSF21048).