loop_ _pdbx_nmr_sample_details.solution_id _pdbx_nmr_sample_details.solvent_system _pdbx_nmr_sample_details.contents 1 MCP-1 '2 mM U-15N,13C, H2O 90 %, D2O 10 %' 2 MCP-1 '1 mM U-50% 15N, MCP-1 1 mM U-50% 13C, H2O 90 %, D2O 10 %' 3 MCP-1 '2 mM U-15N, H2O 90 %, D2O 10 %'