isClinicalMarkerFor Alzheimer's disease Neurodegeneration Neuro-degenerative disease Neurodegenerative disease MSH:D019636 HP:0002180 Ongoing loss of nerve cells UMLS:C0524851 UMLS:C4020854 MSH:D009410 Progressive neurodegenerative disorder UMLS:C0027746 Progressive loss of neural cells and tissue. Abnormal nervous system morphology