Casson, S., Chilley, P., Topping, J., Evans, I., Souter, M., & Lindsey, K. (2002). The POLARIS gene of Arabidopsis encodes a predicted peptide required for correct root growth and leaf vascular patterning. The Plant Cell, 14(8), 1705-1721. https://doi.org/10.1105/tpc.002618