This family includes protein BPS1 (Protein BYPASS 1) from Arabidopsis, which is required for normal root and shoot development. It prevents constitutive production of a root mobile carotenoid-derived signalling compound that is capable of arresting shoot and leaf development [1,2].

1: BYPASS1 negatively regulates a root-derived signal that controls plant architecture. Van Norman JM, Frederick RL, Sieburth LE; Curr Biol. 2004;14:1739-1746. PMID:15458645

2: Dissecting the biosynthetic pathway for the bypass1 root-derived signal. Van Norman JM, Sieburth LE; Plant J. 2007;49:619-628. PMID:17217459