GGT3P and Wolf-Hirschhorn syndrome: The difference in the size with the phenotypic discordance was observed with other microdeletion syndromes viz., Yq microdeletion [27], Wolf-Hirschhorn Syndrome [28], etc. Our microarray analysis found deletion in 22q11.21 in both the twins, except the bigger size (~0.14 MB) of the deletion containing GGT3P gene (gamma-glutamyltransferase 3 pseudogene) in the second twin.