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. And if that's the case then that might be because of vitamin B twelve deficiency. Now in another case we can have a mutation, a deficiency in the mutase. So in an individual who is born with some type of genetic mutation in which this mutase is not active the same thing will happen.