Gluconeogenesis is a process that transforms non-carbohydrate substrates (such as lactate, amino acids, and glycerol) into glucose (Figure 1). Both lactate and alanine are first converted into pyruvate, which then enters the mitochondrion and is carboxylated to oxaloacetate (OAA) by pyruvate carboxylase (PC). A metabolic pathway that generates glucose from non-carbohydrate carbon substrates such as amino acids and lactate.