Summary of μNS regions necessary and sufficient for associations with σNS, μ2, λ1, λ2, σ2, λ3, and core particles. (A) List of all μNS deletion mutants and EGFP/NSP5 fusion proteins tested in this study and the results of their association with the indicated MRV proteins and MRV cores. ND, not determined; NS, nonspecific association. (B) Schematic representation of μNS showing regions of the protein necessary and sufficient for associations with each MRV protein and core particles.