Fig. 1From: Association between preoperative serum homocysteine and delayed neurocognitive recovery after non-cardiac surgery in elderly patients: a prospective observational studyMetabolic relationship between homocysteine, vitamin B12, and folate. CBS, cystathionine β-synthase; MS, methionine synthase; MTHFR, methylenetetrahydrofolate reductaseBack to article page