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. 2021 Apr 13;8:672600. doi: 10.3389/fcvm.2021.672600

Figure 1.

Figure 1

Biogenesis of circ RNAs. There are four main models for the formation of circRNA loops from pre-mRNAs including (A) lariat-driven circularization (exon skipping), (B) intron-pairing driven circularization (direct back-splicing), (C) circular intronic RNAs, and (D) RNA-binding protein (RBP)-driven circularization.