And the next one in line is also the D alanine. And what this nitrogen does is it bonds with this carbon and once it forms a bond, it basically kicks off that terminal dalanine. And that's exactly what forms this green cross linkage that we basically show here. So this connects to this carbon that kicks off this terminal dalanine and that forms the green cross linkage between this terminal glycine on the pentaglycine molecule and this dalanine. The second carbon, the second D alanine, the carbon of that second D alanine. So this is the reaction that takes place, that forms the cross linkages inside bacterial cells.