YfiD of escherichia coli and Y06I of bacteriophage T4 as autonomous glycyl radical cofactors reconstituting the catalytic center of xxygen-fragmented pyruvate formate-lyase - Wagner, A. F. Volker; Schultz, Sabine; Bomke, Jörg; Pils, Thomas; Lehmann, Wolf-Dieter; Knappe, Joachim (Biochemical and biophysical research communications, 2001)