Karyotyping of peripheral blood lymphocytes was performed using standard methods. Genomic DNA of individuals from Families A-C was tested using Human CytoSNP-12 BeadChips (~300 K; Illumina, San Diego, CA, USA). Array data were analysed using GenomeStudio (Illumina) and QuantiSNP
[28 (link)]. FISH employed standard protocols and various combinations of probes listed in Table 
1. The study used genome build hg19.
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