“…Chemical shifts were referenced as described previously ( 34 ). Resonance assignment of the exchangeable and non-exchangeable protons of HSLA and HSLAap was performed as previously described in ( 31 , 32 , 34–36 ) using ( 1 H, 15 N)-HSQC ( 37 ), ( 1 H, 15 N)-CPMG-NOESY ( 38 ), ( 1 H, 1 H)-H5(C5C4N)H (C,U) ( 39 ), ( 1 H, 1 H)-HCCNH-TOCSY (G) ( 40 ), ( 1 H, 1 H)-HCCH-TOCSY (A) ( 41 ), ( 1 H, 1 H)-HCCH-COSY (C,U) ( 42 ), ( 1 H, 15 N)-2bond-HSQC ( 43 ), ( 1 H, 13 C)-H(N)CO ( 44 ), ( 1 H, 13 C)-HSQC ( 37 , 45 ), 3D ( 1 H, 1 H, 13 C)-HCCH-COSY (sugar), 3D ( 1 H, 1 H, 13 C)-HCCH-TOCSY (sugar) ( 42 ) and ( 1 H, 15 N)-HCN ( 46 ). ( 1 H, 1 H)-NOESY ( 47 ) and 3D ( 1 H, 1 H, 13 C)-NOESY-HSQC ( 48 ) spectra were acquired for sequential assignments.…”