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Neurodegenerative diseases are a group of pathologies that mainly affect neurons of the human brain. Particularly, Alzheimer disease (AD) is a neurodegenerative disorder, being manifested by neuronal and synaptic loss. One of the main pathological aspects of AD is aggregation of amyloid-? (A?) peptide. However, there are some neuropeptides that play an important role in immunity and neuroprotection. In addition, the presence of metal ions and their abnormal accumulation play a key role in this pathology. The inter...