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. 2019 Oct 21;116(45):22591–22597. doi: 10.1073/pnas.1908242116

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Fig. 3. — Asymmetrical reconstruction of SPV1. (A) Two distinctive views of SPV1 from the raw EMs, showing concentric rings (Top) and striations (Bottom). (B) The central portion of the asymmetrical reconstruction of SPV1 filtered to 40 Å in the corresponding orientations shown in A. (C) Two-dimensional class averages of masked SPV1 (excluding the outer capsid) match both views seen in A. In the Top average, there is a strong helical periodicity along the nucleoprotein filaments with a pitch of 29 Å. In the Bottom average, the 43-Å spacing between layers is evident. (D) The same EM map in B showing the genome region only, colored by radius. A central section (Bottom Right) highlights the conserved 43-Å spacing between layers and between filaments in the same layer.