Schematic diagram of hypothetical in planta functions of DRM1/ARP. Mitogen activated protein (MAP) kinase, kinase, kinase (MKKK), MAP kinase, kinase (MKK), and MAP kinase (MK) are representative of a generalised signalling cascade resulting in expression of DRM1/ARP’s, in response to a range of abiotic, biotic, and endogenous factors. DRM1/ARP proteins are hypothesised to play a role in growth inhibition via a currently unknown pathway.