_:vb50949580 . _:vb50949580 "url:https://en.wikipedia.org/wiki/Neurodegeneration"^^ . _:vb50949580 . _:vb50949580 . _:vb50949580 . _:vb50949580 "A brain disease that is characterized by loss of structure or function of neurons, including death of neurons and loss of brain tissue."^^ . _:vb50949580 .