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Hierarchy of cell sorting in order of decreasing surface tensions. The equilibrium configuration reflected the strength of cell cohesion, with the cell types having the more cell cohesion segregating inside the cells with less cohesion. The images were obtained by sectioning the aggregates and assigning colors to the cell types by computer. The black areas represent cells whose signal was edited out in the program of image optimization. (From Foty et al. 1996; photograph courtesy of M. S. Steinberg and R. A. Foty.)