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. Author manuscript; available in PMC: 2022 Apr 1.
Published in final edited form as: Curr Opin Virol. 2021 Jan 15;47:32–37. doi: 10.1016/j.coviro.2020.12.004

Figure 1. Rolling-circle replication mechanism.

Figure 1

PSTVd and ASBVd are selected to represent members of Pospiviroidae and Avsunviroidae, respectively. Red and black lines refer to (+)- and (−)-strands of PSTVd, respectively. Purple and yellow lines refer to (+)- and (−)-strands of ASBVd, respectively. Pol II, DNA-dependent RNA polymerase II. NEP, nuclear-encoded plastid RNA polymerase. P, phosphate terminus. OH, hydroxyl terminus.