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Figure 8.8 Ustilago maydis. A schematic model proposed for allele-specific dimerization. The interaction of bE and bW polypeptides from the same b allele produces inactive heterodimers because the DNA-binding domains are buried. Upon mating, two additional new types of active heterodimers are formed in which DNA-binding motifs are exposed. (From Gillissen et al. (1992). With permission of the Cell Press.)

and how the cascades of signal transduction lead to pathogenic growth in the corn plant leading to the fusion of the nuclei in the dikaryon and the completion of the life cycle.

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