In the February 15th issue of Genes & Development, Dr. K. John McLaughlin and colleagues report on their success in using uniparental embryonic stem cells to replace blood stem cells in mice.

Uniparental disomy (UPD) occurs when both copies of a chromosome, or of part of a chromosome, are derived from a single parent. When these chromosomes are different, due to a meiosis stage I error, ...

Before Natalie Nakles was born, before the egg from which she was conceived was even fully mature, something went slightly awry. The egg that would help form her ended up with two copies of chromosome ...