ECM2 and hydrops fetalis: Within the 38 genes, 17 genes (ZMAT1, APBB3, MNS1, AP3M2, BTN3A1, KCNN3, TTC3, SMOC2, LUM, ASPN, FRZB, SFRP4, MATN2, ISLR, PDE5A, ECM2, and FREM1) were highly expressed in HF and 20 genes (FAM58A, CSDC2, C15orf59, S1PR3, VSIG4, CD163, SEMA4B, SLCO4A1, SERPINA3, GGT5, FURIN, ZDHHC16, LAD1, USP31, TUBA3D, TUBA3E, ST6GALNAC3, LCN6, HMOX2, and FCN3) were lowly expressed in HF.