Howeer, metabolic pathways are actually labyrinths of interconnected garden hoses with complicated flow patterns. 然而，事实上，代谢途径如同是由众多错综复杂浇水管道组成的迷宫，它们有着复杂的流动参数。
Secondly the enzyme is inhibited by an intermediate lower down the metabolic pathway, usually either phosphoenolpyruvate or citrate. 其次，减缓代谢途径的一个中间体，通常是磷酸烯醇或柠檬酸降低酶的活性。
