. . . "Definition: Imposes ordering on a step in a biochemical pathway. \nRetionale: A biochemical reaction can be reversible by itself, but can be physiologically directed in the context of a pathway, for instance due to flux of reactants and products. \nUsage: Only one conversion interaction can be ordered at a time, but multiple catalysis or modulation instances can be part of one step."^^ . "Definition: Imposes ordering on a step in a biochemical pathway. \nRetionale: A biochemical reaction can be reversible by itself, but can be physiologically directed in the context of a pathway, for instance due to flux of reactants and products. \nUsage: Only one conversion interaction can be ordered at a time, but multiple catalysis or modulation instances can be part of one step."^^ . "Definition: Imposes ordering on a step in a biochemical pathway. \nRetionale: A biochemical reaction can be reversible by itself, but can be physiologically directed in the context of a pathway, for instance due to flux of reactants and products. \nUsage: Only one conversion interaction can be ordered at a time, but multiple catalysis or modulation instances can be part of one step."^^ . . . .