REAGENT or RESOURCE	SOURCE	IDENTIFIER
Chemicals, peptides, and recombinant proteins
Dulbecco’s phosphate-buffered saline (DPBS)∗	GIBCO	Cat#14190136
Pleiotrophin	Sinobiological Protein	Cat#51000-MNAB
Ocular lubricant∗	Baiyunshan	Cat#212020050
Avertin∗	Sigma	Cat#T48402
tert-Amyl alcohol∗	Sigma	Cat#152463
Ketoprofen∗	Santa Cruz	Cat#SC-363115Rx
Betadine∗	RockTech	Cat#ZH1120087
4% Paraformaldehyde	Solarbio	Cat#P111O
0.9% Normal saline solution	Procell	Cat#PB180353
Experimental models: organisms/strains
Mouse: C57BL/6N	Charles River	Strain code: BCG-T00001
Bacterial and virus strains
MMLV-based retrovirus	This paper	N/A
Software and algorithms
LSM 710 Confocal	Zeiss	N/A
ImageJ	National Institute of Health	RRID: SCR_002798; https://www.graphpad.com/
ZEN Digital Imaging for Light Microscopy	Zeiss	http://www.bitplane.com/
Other
Gloves∗	Medicom	Cat#1154C
Suture∗	RWD	Cat#F35305-50
Suture needle∗	RWD	Cat#F35401-50
Masks∗	Medicom	Cat#2015M
Caps∗	Maydeal	Cat#60014533
Cotton swab∗	Winner	Cat#601-020764-01
Delicate scissor∗	RWD	Cat#S12003
Surgical handle∗	RWD	Cat#S32001
Delicate forceps∗	RWD	Cat#F12010
Haemostatic forceps∗	RWD	Cat#F21011
Standard stereotaxic instrument∗∗	RWD	Cat#68802
Optical fiber cold light source∗∗	RWD	Cat#76301
Syringe holder∗	RWD	Cat#68218
Animal platform∗∗	RWD	Cat#68607
Needle holder∗∗	RWD	Cat#F31031
ThermoStar temperature maintaining apparatus∗∗	RWD	Cat#69020
Heating pad∗∗	RWD	Cat#69023
Temperature probe∗∗	RWD	Cat#69022
Animal surgical microscope∗∗	CQOPTEC	Cat#SZ660
A drill bit∗∗	RWD	Cat#78041
Drill∗∗	RWD	Cat#78001
Electric razor∗∗	RWD	Cat#CP-5200
Microsyringe∗∗	Hamilton	Cat#87943
Microsyrige needle∗∗	Hamilton	Cat#7762-04
Cyanoacrylate adhesive∗∗∗	Loctite	Cat#45404
Brain Infusion Kit∗∗∗	Alzet	Cat#0008851
Mini-osmotic pumps∗∗∗	Alzet	Cat#1002