NTRK1 and Alzheimer disease: Moreover, a loss of the NGF receptor TrkA was found in the basal forebrain (Boissiere et al.1997; Chu et al.2001; Ginsberg et al.2006a; Mufson et al.1997, 2000; Salehi et al.1996) and in the cortex (Counts et al.2004; Hock et al.1998; Savaskan et al.2000) of AD brains.