iii) circRNA0100 and circRNA1926 can function as miRNA sponges to regulate HFSCs growth and HF development; specifically, they can induce cashmere goat secondary HFSCs to differentiate into the HF lineage via sequestration of the miR-153-3p/KLF transcription factor 5 (KLF5) axis and the miR-148a/b-3p/cyclin-dependent kinase 199 (CDK1) axis, respectively [22,23]. This evidence concerns the gene CDK1 and hydrops fetalis.