Fig. 1

Overview of the identified circRNAs by RNA-seq analyses in ovaries of gilts. a CircRNAs were identified by two algorithms. b The Venn diagram shows the number of unique and common circRNAs in pre-, in- and post-puberty. c Circos plot of the circRNAs distribution in the whole genome of gilts. The outermost circle represents the distribution of the number of circRNAs, the blue circle represents the distribution of expression level of circRNAs, and the red inner circle represents the length of circRNAs. d Expression level of circRNAs in three stages, *p < 0.05. e Genomic dance of all detected circRNAs. f Transcript length of circRNAs. g Proportion of three types and exon number of the circRNAs in three stages. h The upset plot of three types of circRNAs and the corresponding parental genes