Previous research uses VEGF for exploring avian diseases like tibial dyschondroplasia (TD; Zhang et al., 2013; Huang et al., 2017), tumor angiogenesis (Duffy et al., 2013), and increasing angiogenesis in chicken embryo membranes (Fernandez and Bonkovsky, 2003). The gene discussed is VEGFA; the disease is thanatophoric dysplasia.