Well, the peptides are basically broken down by cellular proteases into individual amino acid units. And then those amino acids are basically used for various processes. And their fate depends on what the cell actually needs. If the cell needs to synthesize proteins or nucleotide bases, then we can use these amino acids for that. But if the cell needs to use the amino acid for energy, what it can do is it can remove the carbon skeleton. It could remove that urea via the urea cycle and we'll talk about that in more detail.