QPCR levels of 12 endo-(1,4)-β-glucanase genes across the developmental tissue series from barley. The vertical axis is a log10 scale and shows relative transcript levels of the genes normalised against three control genes. The vertical axis crosses the horizontal axis at 1000 copies mRNA per μl normalised cDNA. This is an arbitrary level, below which transcript levels are considered to be unreliable.
Buchanan et al. BMC Plant Biology 2012 12:235 doi:10.1186/1471-2229-12-235