1995f-877 adaptation alzheimer'sdisease alzheimerdisease analysis brain congresses development fibroblastgrowthfactors genetics growth growthfactors nervegrowthfactor nerveregeneration nerves nervoussystem neuralcircuitry neuronalplasticity neurons neurophysiology neuroplasticity neurotransmitteragents neurotrophicfunctions physiologicaleffect physiology regeneration synapses trends wl102n2785n1987 wl300n49381731987 wm220g8841990