SMS and Williams syndrome: Turner et al. analyzed four NAHR loci related to well-studied genomic disorders (Williams-Beuren Syndrome deletion (WBS; MIM194050) and 7q11.23 duplication (MIM609757); the AZFa deletion (azoospermia (MIM415000) associated) and its reciprocal duplication; the HNPP deletion and CMT1A duplication; and the SMS deletion and PTLS duplication) in the sperm populations of five persons.