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Structural superposition of the three NAP–histone complexes - ScNAP1, CeNAP1 and AtNRP1. Only ScNAP1 dimer is shown as surface in two orientations for simplicity. The monomers are colored pink and tan. Histone H2A–H2B dimer that binds to ScNAP1 is shown as purple ribbon. The histone H2B 1–H2A fusion protein bound at CeNAP1–histone binding region is shown as orange ribbon. Similarly, two H2A–H2B dimers bound at AtNRP1 binding region are shown as blue and green ribbon
