Plant peptide hormones: The long and the short of it Keith Lindsey  Current Biology  Volume 11, Issue 18, Pages R741-R743 (September 2001) DOI: 10.1016/S0960-9822(01)00435-3

Fig. 1 A model for the systemic wound reponse in tobacco. Following wounding, a secreted prohormone may release smaller peptides, Tob Sys I and Tob Sys II, which activate defence gene transcription via a MAP kinase signalling pathway in non-wounded leaves. Current Biology 2001 11, R741-R743DOI: (10.1016/S0960-9822(01)00435-3)