Int. j. mol. sci. Int. j. mol. sci. Mutation of aspartate 238 in FAD synthase isoform 6 increases the specific activity by weakening the FAD binding Leone Piero Galluccio Michele Quarta Stefano Anoz-Carbonell Ernesto Universidad de Zaragoza Medina Milagros Universidad de Zaragoza Indiveri Cesare Barile Maria 2019 research-article