NTRK1 and Alzheimer disease: CircLPAR1 (circRNA lysophosphatidic acid receptor 1), circAXL (circRNA AXL receptor tyrosine kinase), circGPHN (circRNA gephyrin), and circGPI (circRNA glucose-6-phosphate isomerase) were shown to be upregulated in cerebrospinal fluid samples from AD patients by a circRNA microarray [10].