Figure 1C. Copyright: This image is from Yu BD; Hanson RD; Hess JL; Horning SE; Korsmeyer SJ, "MLL, a mammalian trithorax-group gene, functions as a transcriptional maintenance factor in morphogenesis." Proc Natl Acad Sci U S A 1998; 95: 10632-6. [PMID:9724755] Copyright 1998 National Academy of Sciences, U.S.A.