This was further corroborated by the lack of detectable transfer between human CRX-tdTomato photoreceptors and mouse Nrl::GFP rod photoreceptors in vitro and is consistent with results presented by Ortin-Martinez et al. [16], where they reported that transplanted human glioblastoma cells also did not transfer to the recipient mouse retina. The gene discussed is NRL; the disease is glioblastoma.