New research shows people carrying 2 copies of a certain gene are more likely to have Alzheimer’s PBS NewsHourAPOE4 homozygozity represents a distinct genetic form of Alzheimer’s disease Nature.comStudy Suggests Genetics as a Cause, Not Just a Risk, for Some Alzheimer's The New York TimesGenes known to increase the risk of Alzheimer’s may actually be an inherited form of the disorder, researchers say CNNScientists claim to have found another distinct genetic form of Alzheimer’s The Guardian