AKAP13 and hydrops fetalis: The circular RNA of AKAP13 was selected because circAKAP13 (hsa_circ_0104801) was increased both in HF (Fig. 2b and c) and after siRNA-mediated reduction of ADAR2 (Fig. 3m), whereas the host gene AKAP13 was among the most highly regulated protein-coding mRNAs at the level of RNA editing in HF (Fig. 1c).