Several cell lines were screened for their response to three standard chemotherapy drugs: fludarabine, vincristine, and Gleevec; decreases in the mean optophoretic distance of Bcr-Abl positive cell line K-562 with no effect in the other cell lines demonstrate that the downshift in mean displacement is specific to the presence of the Bcr-Abl oncoprotein; fludarabine, however, was ineffective in causing a decrease in the optophoretic displacement of the K-562 cell line, but showed an effect in the other four cell lines; mobility values for each cell in the population have been taken and averaged, but data on subsets of the cells can still be extracted and further analyzed.

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