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Mass spectral analysis of the products of E. coli GCH II (A), SCO 1441 (B), SCO 2687 (C), and SCO 6655 (D) proteins. The products were isolated as described in Materials and Methods. The mass spectrum of the product of E. coli GCH II is shown for comparison. In some cases, a [M− + Na+] complex is also observed.
