Multi‐tissue cytogenetic analysis for the diagnosis of mosaic Down syndrome: A case report oleh Wilberg A. Moncada Arita, Eduardo Smelin Perdomo Domínguez, Astrid Yohaly Rivera Caballero, Nelson A. Espinoza‐Moreno, Mauricio E. Zavala Galeano, Barbara R. DuPont, Héctor M. Ramos‐Zaldívar