Identification of the t(3; 7)(p13; q22) in case no. 6 by YAC clone HSC7E572 (Cy3). Note the three red signals that originate from the normal chromosome 7 (upper left), the derivative 7 (lower left), and the derivative 3 chromosome (upper right). For the identification of chromosome 3, we cohybridized with a YAC clone (fluorescein isothiocyanate) mapping to the long arm of chromosome 3.