. . "High blood levels of the amino acid homocysteine" . "hyperhomocysteinemia" . . "578" . "High homocysteine levels" . . . "Hyperhomocysteinemia" . "Hyperhomocysteinemia" . "neuro" . "29853" . . "Elevated levels of homocysteine" . . "270.4" . . . . . . . . . .