We have to take energy away from ATP to basically form the peptide bonds that hold these amino acids together inside protein molecules. And fact number three is the reason that inside our cells these proteins don't spontaneously break apart. And these peptides don't spontaneously break apart is because this reaction here is kinetically unfavorable and this reaction is kinetically favorable. And what that means is there's simply too much energy in the activation barrier for us to actually go in reverse from the products to our reactants. So peptide bonds are kinetically stable. We would have to increase, increase the temperature to a high temperature or we would have to use an enzyme that decreases that activation energy to actually break the peptide bond and go back to these individual constituent amino acids.