PADI4 and osteosarcoma: Kolodziejs et al. detected PADI4 with a molecular weight of 70 kDa in leukemia cells (Kolodziej et al. 2014), Guo et al. detected PADI4 with a molecular weight of 74 kDa in osteosarcoma (Guo et al. 2021), Hollingsworth et al. detected PADI4 with a molecular weight of 65 kDa in mouse retinal cells (Hollingsworth et al. 2018), and Uysal-Onganer et al. detected PADI4 with a molecular weight of 25 kDa in human pancreatic cancer cells (Uysal-Onganer et al. 2021).