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. 2024 Aug 15;13(8):692. doi: 10.3390/pathogens13080692

Figure 1.

Figure 1

Schematic diagram of in vitro artificial RNA cyclization methods. (A) Chemical synthesis. (B) Ligation by T4 RNA ligase. (C,D) The ribozymatic process used in in vitro cyclization to synthesize circRNA: (C) cyclization based on type I intron PIE system, (D) cyclization based on type II intron self-splicing.