Inactive cytochrome unable to convert L-DOPA to cyclo-DOPA in the betalain pathway and producing a yellow mutant phenotype. A frameshift replaces 108 amino acids of the active protein found in red beets (AC I3PFJ5) with 27 new residues followed by a stop codon. Pigment biosynthesis; betalain biosynthesis. Belongs to the cytochrome P450 family.