... organisms as diverse as Neurospora crassa,Candida tropicalis, Dictyostelium discoideum, Medicagovaria (alfalfa), Arabidopsis t haliana, Oryza sativa (rice),Caenorhabditis elegans, Drosophila m elanogaster, ... from a single ancestral Bsubunit. In summary, in this study we have de®ned t wo separatePP 2A b inding domains in the regulatory a nd targeting B 5 6a subunit, which a re conserved in sequence a ... 2). A seconddomain e xtending from amino acids 325 ±383 wa s capable ofindependently binding to GST -A ( Fig. 2). These regionswere named A subunit b inding domains (ASBD) 1 and 2.Given that...