Figure 1.

Experimental expression analysis of known and predicted genes in the Arabidopsis genome. A, Summary of EST/mRNA-supported and purely predicted genes in the Arabidopsis genome (as of March 20, 2003) and its coverage by the 70-mer oligo microarray used in this study. The relative proportions of the genes either expression confirmed or not in our analysis are separated by a green vertical line. B, Diagram of organ sample collection during the Arabidopsis life cycle. C and D, GO categories of genes expressed in at least one organ or in cultured cells (C) and in all collected organs and cultured cells (D).