As per Mini-Mental State Examination (MMSE) of three groups with 23 patients in the early phase, 23 patients in the middle phase, and in 28 patients in the last phase of AD, also matched with 49 elderly controls, the substantial connection between age and MMSE scores and MAO-B activity were recognized, manifesting that such indicators may portray the complexity and therapeutic progression of AD [41]. Here, MAOB is linked to Alzheimer disease.