Identification and analysis of key circRNAs in the mouse embryonic ovary provides insight into primordial follicle development.

"data availability all data relevant to the study has been submitted to the sra database study accession number: prjna934979.; the data is accessible at the following link: https://www ncbi nlm nih gov/sra/prjna934979 . data availability all data relevant to the study has been submitted to the sra database study accession number: prjna934979"

"Declarations Ethics approval and consent to participateAll experiments were reviewed and approved by the Animal Ethical and Welfare Committee of Ningxia University (approval number IACUC-NDLAC-2022022). All the method were carried out in accordance to relevant guidelines and regulation. Animal experiments were carried out in accordance with ARRIVE guidelines. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This work was funded by Scientific research project of Ningxia Education Department(NGY2020004)and Ningxia Natural Science Foundation Project (2020AAC03115)."