Interphasic dual color 10q24 FISH. Probes were labeled as follows: TLX1-5′ FITC, green signal; TLX1-3′ rhodamine, red signal. (A) Two fusion signals, indicative of 2 intact 10q24 loci. (B) A fusion signal and a split signal, indicative respectivley of a normal 10q24 locus and a 10q24 locus rupture, suggesting a translocation.