a, Pie charts that represent the relative abundance of differentially expressed genes within the core hypoxia-inducible set1, in a comparison between the SAM and juvenile leaf tissues, and the root meristem (RM) and elongation zone and maturation zone of the root. Absolute expression levels, standard error, ratios and statistics are shown in Supplementary Tables 1 and 2 for shoots and roots, respectively. b, Schematic of SAM and root meristem cell types. c, Heat map showing the expression levels of core hypoxia-inducible genes in the SAM and root-meristem cell types depicted in b. Absolute expression levels were retrieved from the Arabidopsis eFP browser (http://bar.utoronto.ca/efp/cgi-bin/efpWeb.cgi), and are provided in Supplementary Table 3.