Alzheimer disease 4 article 4 presenilin 1 priority journal 4 3 [(3 cholamidopropyl)dimethylammonio] 1 propanesulfonic acid 2 Apoptosis 2 Aβ40 2 Aβ42(43) 2 Morpholino oligonucleotide 2 PS1/βAPP complex 2 Presenilin 2 Presenilin-1 2 Primary neurogenesis 2 Proliferation 2 Sonic hedgehog 2 Xenopus 2 Xenopus laevis 2 amino terminal sequence 2 amyloid beta protein 2 antisense oligonucleotide 2 apoptosis 2 carboxy terminal sequence 2 cell line 2 cell lysate 2 controlled study 2 embryo 2 enzyme inhibitor 2 gamma secretase 2 gene expression regulation 2 immunohistochemistry 2