fish Reproduction BritannicaGreen–red fusion yellow signals suggest a traditional cell. Separate green and red signals imply the presence of translocations. b FISH method to detect the t9;22 uses two in a different way categorised probes. A normal interphase nucleus left exhibits four separate signals, two for each allele of BCR green and ABL red. The appearance of a red green fusion signal nucleus to right suggests the presence of BCR ABL and is diagnostic of CML Taken from 6. growth.