For example, AChE catalyzes the hydrolysis of acetylcholine, decreasing its availability in the synaptic space [17], and inhibitors of AChE have been used as palliative drugs for AD, including synthetic compounds as tacrine [18], donepezil [19], galanthamine [20] and rivastigmine [21], which have all been proven to improve a little the situation of AD patients. The gene discussed is ACHE; the disease is Alzheimer disease.