What exactly will happen? Well, in an individual that is vitamin B twelve deficient, this reaction will not actually take place and will have a build up of this intermediate molecule. So because we have no vitamin B twelve in vitamin B twelve deficiency, this mutase will not be able to transform the lmethyl malnol coenzyme a into the suclaim A. And that will essentially build up this lmethyl malnol coenzyme a. And that particular individual will begin to excrete this molecule in the urine. And so a physician can basically test the patient's urine and look for the buildup, look for the presence of this molecule.