So we reform the Histidine 57 side chain and we also form this final product, the carboxylic acid. And so now this is one of the products, this is the other product. And together we see that the end result is the cleavage of that peptide bond. So this bond between the nitrogen and the carbon was essentially cleaved in this step as described here. And so in the final step, this carboxylic acid product basically departs. It leaves the active side.