The G51S purine nucleoside phosphorylase polymorphism is associated with cognitive decline in Alzheimer 's disease patients .
O B-SequenceVariant B-GeneOrGeneProduct I-GeneOrGeneProduct I-GeneOrGeneProduct O O O O B-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature O B-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature B-OrganismTaxon O