Figure 2

Three classes of solutions. Examples of solutions at time class 6 (t = T6) in the full (dashed lines) and simplified (solid lines) models for three different Bcd profiles corresponding to three classes I-III (A-C, correspondingly). The simplified model equations were obtained from the full model equations by neglecting the diffusion term and the influence from Tll (see Methods). (A): In class I, all borders are present and in the correct order, as is the case with the median Bcd profile. (B): In class II, the anterior Kr border is missing in the full model but present in the simplified model, typically in association with ectopic anterior expression of Kr in place of gt, possibly with some ectopic gt expression. (C): In class III, the anterior Kr border and anterior gt domains are absent in both the full and simplified models.