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Fig. S1 GFPer expression patterns observed in the J0571 enhancer trap line.

Fig. S2 ITD1-mCherry can traffic across the mesophyll–epidermal boundary in young leaves.

Fig. S3 Multiple sequence alignment of the zinc finger motif (ZFM) spanning region from 35 Arabidopsis Dof family members.

Fig. S4 Neighbor-joining tree of Arabidopsis Dof family based on full-length protein sequences.

Fig. S5 Neighbor-joining tree of select KNOX homeodomain (HD) family members based on their HD sequences.

Fig. S6 Alignment of the intercellular trafficking motifs for some known noncell-autonomous (NCA) proteins.

Table S1 List of primers employed in the cloning experiments

Table S2 List of species tested for Dof intercellular trafficking motif (ITM) trafficking

Table S3 List of species tested in phylogenetic tree of homeodomain (HD) family

Table S4 Trichome rescue assay statistics for INTERCELLULAR TRAFFICKING DOF 1 (ITD1) deletion experiments

Table S5 Trichome rescue assay statistics for positive control experiments conducted with the indicated intercellular trafficking motif/homeodomain (ITM/HD) regions expressed in the epidermis

Table S6 Trichome rescue assay statistics for experiments conducted with Dof intercellular trafficking motifs (ITMs) from the indicated species

Table S7 Trichome rescue assay statistics for experiments conducted with the indicated homeodomain (HD) regions