<qa>  What is the rule of GTP?Recruited patients should receive the endoscopic surgery for picking the olfactory mucosa 1 to 2 months before transplantation. The Olfactory Ensheathing Cells OECs will be cultured and expanded under the rule of GTP. Then, quality control of OECs should be done by immunohistochemical staining positive for GFAP, S100, and P75. Finally, the investigators will transplant the OECs about 2 to 8 X 10 6 cells in saline into the peri-infarcted area of the brain. 