# OC Root 2nd 3rd PC Gene/Definition OC.252498 Archaea.33267 Euryarchaeota.38633 mer.1299 mer:MMINT_14580 bifunctional phosphoribosyl-AMP cyclohydrolase/phosphoribosyl-ATP pyrophosphatase protein; K11755 phosphoribosyl-ATP pyrophosphohydrolase / phosphoribosyl-AMP cyclohydrolase [EC:3.6.1.31 3.5.4.19]