Relative level of gene transcription in leaves of the tae mutant of different ages as compared to the WT. The level of gene expression in the leaves of WT of the same biological age as in the mutant was taken as one unit. (a, b) Expression of genes for pluripotency and epigenetic regulators, respectively. The Supplementary (Fig. 1) shows the absolute expression level for the KN6 and STM genes that were not expressed in the 4a leaves of WT. Values are presented as arithmetic mean ± standard error of the mean of three biological replicates. The asterisk marks statistically significant differences from the level of WT expression (Student’s t‑test, significance level: * 0.01 < P < 0.05; ** 0.001 < P < 0.01; *** P < 0.001). White, light gray, and dark color indicates leaves of the second, third, and fourth ages, respectively.