So I noticed that one of the FA corrections says that the rate-limiting step of gluconeogenesis is fructose 1,6 bisphosphate and not pyruvate carboxylase. I was just going through questions on USMLERx, and one of the question directly asked me what the rate limiting step was. I put down fructose 1,6 bisphosphate, but the correct answer was pyruvate carboxylase. I looked it up in Lippincott's Biochem and BRS biochem, and neither one mentions which is the rate-limiting step, although both list pyruvate carboxylase as the first step. Can somebody clarify this for me? Do you think USMLERx has pyruvate carboxylase as the answer because that's what it says in FA and it's made by the same people? Or is that actually the answer? Thanks!