This team also reported that after transplantation of OECs and olfactory nerve fibroblasts into the subretinal cavity of rats with RP, they could migrate to other retinal layers and removed the accumulated photoreceptors outer segment debris in the subretinal cavity, and expressed and secreted NGF, BDNF and basic fibroblast growth factor (BFGF), which contributed to the survival of photoreceptors [86]. This evidence concerns the gene FGF2 and retinitis pigmentosa 1.