DACH2 and hydrops fetalis: After artificial selection regions showed differentiation between the LH and HF groups, such as 15.23–15.30 MB (ZFst = 3.769) in chromosome 10, 26.70–26.85 MB (ZFst = 3.769) in chromosome 25, 26.78–26.85 MB (ZFst = 3.6286) in chromosome 25, and 58.50–58.65 MB (ZFst = 3.6286) in chromosome X, which contained CORO2B (coronin, actin binding protein, 2B), TRNAR-UCG (transfer RNA arginine, anticodon UCG), ITGAL (integrin alpha L), ZNF768 (zinc finger protein 768), ZNF689 (zinc finger protein 689) and DACH2 (dachshund family transcription factor 2) (Fig. 2B).