part of part of has input has input has output has output process reaction O(2) + choline = H(2)O(2) + betaine aldehyde 1 1 1 1 1 KEGG:R01022 RHEA:13508 METACYC:CHOLINE-OXIDASE-RXN reaction UPa:UCR01022 betaine from choline: step 1/1 O(2) H(2)O(2) choline betaine aldehyde