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Effects of recombinant NAD+ synthetase on cell proliferation in vitro. Murine mononuclear spleen cells were stimulated with 25 (▪) or 50 (▴) μg of recombinant NAD+ synthetase or with 100 μg of recombinant enolase (⧫). The standard deviations of triplicate samples, repeated twice, are shown as vertical bars.
