PADI4 and Schnyder corneal dystrophy: The gene expression of Padi4 is elevated in subjects with SCD (Hounkpe et al, 2021), and neutrophil extracellular traps (NETs) contribute to vasoocclusion in murine and human SCD (Caudrillier et al, 2012; Chen et al, 2014; Vats et al, 2017).