. "ACTIVATION"^^ . . "LEFT_TO_RIGHT"^^ . "CPSI synthesises carbamoyl phosphate in three steps: bicarbonate phosphorylation by ATP, carbamate synthesis from carboxyphosphate and ammonia, and carbamate phosphorylation by ATP."^^ . . . . . "ammonia-dependent carbamoyl-phosphate synthase"^^ . . . "ammonia-dependent carbamoyl-phosphate synthase"^^ .