NPSC and NPI were isolated as described previously35 (link). Prior to transplantation the number of cells was determined by measuring
the total cellular DNA content using the Quant-iT PicoGreen dsDNA quantification
assay (Invitrogen, Carlsbad, CA, USA)35 (link). Aliquots consisting of 11 × 106 cells were gently placed
under the kidney capsule of isofluorane-anesthetized Lewis rats35 (link).