(A) NEXT subunits and their domain organization.
(B) Composite map of human NEXT homodimer generated from local 3D refinement.
(C) Model of human NEXT homodimer bound to RNA substrate 1 in two orientations. Each subunit is labeled and colored uniquely.
(D) Solvent-excluded surface representation of NEXT protomer A in two orientations with each domain labeled and colored as in (A). See also Figure S1-3 and Table S1.