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Purification of the S. sobrinus recombinant NAD+ synthetase. Molecular mass standards (lane 1), uninduced cell lysate (lane 2), IPTG-induced cell lysate (lane 3), material loaded into the Ni affinity column (lane 4), column flowthrough (lane 5), and different fractions of the eluted NAD+ synthetase (lanes 6 and 7) were resolved by SDS-PAGE and stained with Coomassie blue.
