From the book reviews: "The book discusses basic concepts avoiding technological language, making book accessible for both lay people and clinical geneticists. ... This is a highly specialized book on a specific molecular/cytogenetic process. ... It should be a great aid for clinical geneticists to make them aware of the phenotype expected in situations where UPD is involved. Patients with UPD and their parents may find the book informative." (Luis F. Escobar, Doody's Book Reviews, September, 2014)