Transcription factor that binds specifically to a 5'-AA[AG]G-3' consensus core sequence (By similarity). Probably involved in early processes for vascular development (PubMed:17583520). The PEAR proteins (e.g. DOF2.4, DOF5.1, DOF3.2, DOF1.1, DOF5.6 and DOF5.3) activate gene expression that promotes radial growth of protophloem sieve elements. Triggers the transcription of HD-ZIP III genes, especially in the central domain of vascular tissue (PubMed:30626969). Mobile protein observed in symplastic trafficking; movements are repressed by HD-ZIP III proteins. Specific to the vascular tissues (PubMed:17583520). The PEAR proteins (e.g. DOF2.4, DOF5.1, DOF3.2, DOF1.1, DOF5.6 and DOF5.3) form a short-range concentration gradient that peaks at protophloem sieve elements (PSE) (PubMed:30626969). Specific to the midveins, containing narrow procambial cell files. Expressed in procambial cells of leaf primordia, roots and embryos, prior to the completion of xylem differentiation. By cytokinin in procambium. Antagonized by the HD-ZIP III proteins and by mobile miR165 and miR166 microRNAs. The pear1 pear2 tmo6 triple mutant variably displays reduced radial growth. The pear1 pear2 dof6 tmo6 quadruple mutant plants showed a greater uniform reduction in radial growth, associated with compromised symplastic trafficking.