Genetic Basis of a Leukemia Subtype Revealed Along with a Possible Targeted Therapy (video) St. Jude Children's Research Hospital Share Print E-Mail Loading video... Caption This image is an example of fluorescence in situ hybridization, or FISH. The image shows a chromosomal rearrangement or fusion central to MEF2D-rearranged acute lymphoblastic leukemia. Credit St. Jude Children's Research Hospital Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.