Transcription activator involved in the control of flavonoid pigmentation. Corresponds to one of the seven genes studied by Gregor Mendel in 1866. The white flowered cv. Cameor (a allele) has a truncated non-functional BHLH protein (AC E3SXU5) due to a point mutation resulting in a mis-spliced transcript (PubMed:20949001). Belongs to the bHLH protein family. On the garden pea - Issue 159 of April 2014