Trancsription activator, when associated with MYB75/PAP1 or MYB90/PAP2. Homodimer (Probable). Interacts with MYB75/PAP1, MYB90/PAP2, MYB4, MYB5, MYB6, MYB23, MYB82, MYB113, MYB114, TT2, MYB0/GL1, and MYB66/WER. A number of isoforms are produced. According to EST sequences. Mostly expressed in developing seeds. Also detected in stems and leaves. By cold, UV, flagellin, jasmonic acid (JA), and salicylic acid (SA) treatments.