Phosphofructokinase: Structure and Function* *The investigations cited in this review and in the unpublished experiments carried out in the authors' laboratory were supported by research grants from the Deutsche Forschungsgemeinschaft Pa 111 (1–6) and Umweltbundesant (West Berlin). One of us (ARG) is grateful for support from the National Institutes of Health in the form of a postdoctoral fellowship and to Professor Gordon Hammes of Cornell University for support and encouragement.