Cover photograph (Copyright © 2004, American Society for Microbiology. All Rights Reserved.): Multicolor bimolecular fluorescence complementation analysis of the subnuclear sites of interactions between different members of the Myc/Max/Mad family in living cells. Two complementary nonfluorescent fragments of cyan fluorescent protein or yellow fluorescent protein produce fluorescent complexes of different colors when brought together by interactions between Myc/Max/Mad proteins fused to each fragment. This enables simultaneous visualization of the cellular localization of multiple complexes in the same cell. The images shown were obtained in multiple experiments. (See related article in May 2004, issue 10: vol. 24, p. 4294.)