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αFp-AB activity in rabbit sera after vitamin B2 application. An ELISA was performed with 6-hydroxy-d-nicotine oxidase (6HDNO) as antigen and sera from a rabbit immunized with sarcosine oxidase (SaO). The assay shows the αFp-AB-activity of the sera before (lane 1) and after immunization (lane 2), after in vitro preincubation of the antiserum with vitamin B2 (lane 3) and after i.v. application of vitamin B2 to the rabbit on 3 consecutive days (lanes 4, 5 and 6).
