Flavins Keep a Handy Helper in their Pocket (image) University of Freiburg Share Print E-Mail Caption In the active center of the enzyme is a flavin cofactor. In the enlargement we can see that near it, oxygen (O2) is bound -- enabling the flavin to be activated. Credit Source: Robin Teufel, Raspudin Saleem-Batcha Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.