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. 2007 Nov 30;3(11):e233. doi: 10.1371/journal.pcbi.0030233

Figure 6. Model for Sharpening of ubx Expression Boundaries by iab-4 .

Figure 6

(A) The assumed transcription profiles of ubx (green) and iab-4 (red).

(B) In the absence of iab-4 (or when the interaction between iab-4 and ubx is inhibited), the expression pattern of ubx is broad and smooth.

(C) When iab-4 and ubx interact, the expression pattern of ubx becomes narrow and sharp. The diffusion constant is D = 0.001; see Methods for other parameter values. The embryo-like shape is for illustrative purpose only.