CRHR1 and Alzheimer disease: Finally, other LR pairs possibly related to AD involved genes that encode receptors, such as epidermal growth factor receptor (EGFR), insulin receptor (INSR), corticotropin-releasing hormone receptor 1 (CRHR1), and adenylate cyclase-activating polypeptide type I receptor (ADCYAP1R1) (Additional file 1: Fig. S2c, d).