Transcription activator, when associated with BHLH2/EGL3/MYC146 or BHLH12/MYC1. Involved in epidermal cell fate specification in leaves. Together with TTG1 and GL3, promotes trichome formation and endoreplication. Regulates the production of a signal that induces hair (trichome) precursor cells on leaf primordia to differentiate. Binds to the WER-binding sites (WBS) promoter regions and activates the transcription of target genes (By similarity). Homodimer and heterodimer with MYB82 (PubMed:24803498). Interacts directly with GL3 and BHLH2. Part of a complex made of GL1, GL3 or BHLH2, and TTG1. Interacts also with BHLH2/EGL3/MYC146 and BHLH12/MYC1. Interacts with MYB82 (PubMed:24803498). Detected in trichome nucleus. Expressed in leaves, stems and flowers (PubMed:11437443). Expressed in trichome cells and in leaf primordia (PubMed:9625690). Ubiquitous in young leaves primordia. Becomes more prominent in developing trichome cells but disappears progressively when trichomes begin to initiate branches. Up-regulated by gibberellins (PubMed:9625690). May be regulated by GEBP and GEBP-like proteins (PubMed:12535344). More to it than meets the finger - Issue 120 of August 2010