Figure 2.

A comparison of gene expression pattern and auxin fluxes regulating cell fate determination during early embryogenesis in Arabidopsis (A) and maize (B), respectively. Colors represent expression of different genes as indicated in the legends. Auxin fluxes are shown by red arrows. Transcripts are written in italic and proteins in normal letter code. Stages and major differentiation mechanisms are indicated. Abbreviations: AC, apical cell; ACD, asymmetric cell division; BC, basal cell; EP, embryo proper; HY, hypophysis; RAM, root apical meristem; SAM, shoot apical meristem; SCU, scutellum; SU, suspensor.