Children with focal hyperinsulinism of infancy display a dramatic, non-neoplastic clonal expansion of β cells that have undergone mitotic recombination, resulting in paternal disomy of part of chromosome 11. This disomic region contains imprinted genes, including the gene encoding the cell cycle inhibitor p57Kip2 (
Dana Avrahami, Changhong Li, Ming Yu, Yang Jiao, Jia Zhang, Ali Naji, Seyed Ziaie, Benjamin Glaser, Klaus H. Kaestner
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