spt mutants have larger RAMs than wild type. (A) Micrographs of 5 DAG roots. Arrowheads indicate the zone of cell division. (B) RAM size expressed as number of cells in the cortex. (C) Length of the RAM. Values are means (n = 15) ± standard error. Asterisks indicate values significantly different from wild type at P < 0.05. Scale bars indicate 100 μm.
Makkena and Lamb BMC Plant Biology 2013 13:1 doi:10.1186/1471-2229-13-1