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 CNNPeople with two copies of a risk gene have genetic form of Alzheimer's, scientists say Reuters