Top row L‐R: Maternal and zygotic Zfp57 loss causes ectopic overproduction of bloodIslands, ventral aspect at stages 11.5 and 12.5. Bottom row L‐R: Loss of only zygotic Zfp57 caused no obvious morphological change during heart development; ventral aspect at stages12.5 and 13.5. From: Maternal and zygotic ZFP57 regulate coronary vascular formation and myocardium maturation in mouse embryo; Junzheng Zhao, Jingjie Zhao; https://doi.org/10.1002/dvdy.530..By Junzheng Zhao and Jingjie ZhaoReported by Author; Author