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Fluorescence in situ hybridization with probes for chromosomes X (red), Y (green) and 18 (blue) on sperm of one DFS patient showing (a) haploid spermatozoa X18/Y18; (b) disomy 18; (c) disomy X; (d) disomy XY; (e) diploidy XX1818; (f) nullisomy 18/0 and 0/X
