For example,a cohort study of depressive patients and healthy controls found that MTHFR polymorphism were more common in the individuals with depression history compared to controls67, while a study over a 60-month follow-up with depressed subjects indicated that the CC genotype of MTHFR C677T were more likely to have more severe symptoms compared to TT genotype carriers68. The gene discussed is MTHFR; the disease is depressive symptom measurement.