SANTA CLARA, Calif.—Researchers at Baylor College of Medicine in Houston have, for the first time, observed a unique way that DNA additions or deletions associated with a wide range of diseases are introduced in genes during cell division. These types of “errors” have been associated with Alzheimer’s, Parkinson’s, Potocki-Lupski Syndrome and other developmental and neurological disorders, and the findings have been published in the journal Cell in an article titled “A DNA Replication Mechanism for Generating Nonrecurrent Rearrangements. Associated with Genomic Disorders.” Custom Agilent oligonucleotide comparative genomic hybridization microarrays are said to have played a key role in the discovery.