NTRK1 and glioma: As previously reported, GA-amide was found to bind with TrkA at the juxtamembrane regions, an event that was determined to be necessary for the membrane penetration of GA-amide since the deficiency of TrkA in the area prevented the entry of GA-amide into the cells.18 Based on this, we examined the expression of TrkA in normal brain tissues and glioma tissues from the same mice.