Fig. 2: Identification and characterization of circRNAs in SPEVs.

a Venn diagram of circRNAs identified in the current study and porcine circRNAs contained in the circAtlas and circNET databases. b The proportions of exonic circRNAs, intronic circRNAs and intergenic region circRNAs in all samples. H represents high sperm motility group and L represents low sperm motility group. c The number of identified circRNAs in each chromosome. d Cumulative expression distribution of three different types of circRNAs. e Distribution of host genes encoding different numbers of circRNA isoforms. f Distribution of conservation scores of different types of circRNA. g The reverse complementary matches (RCMs) in the flanking sequences of back-splice junction (BSJ) sites of exonic circRNAs.