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1Department of Microbiology, Yale University, New Haven, Connecticut
3
Fellow of the National Institutes of Health.
1
The authors wish to dedicate this review to the memory of A. J. Kluyver whose formulation of the comparative biochemistry of hydrogen transfer has contributed greatly to our understanding of autotrophic metabolism.
2
Original work mentioned in this review has been supported by grants from the National Science Foundation, a grant from the Medical Fluid Research Fund of Yale University, and by fellowships to the junior author from the National Foundation for Infantile Paralysis and the National Institutes of Health.