Enables protein-arginine deiminase activity. Involved in histone citrullination; nucleosome assembly; and stem cell population maintenance. Predicted to be part of protein-containing complex. Predicted to be active in cytoplasm and nucleus. Is expressed in blastocyst; early embryo; and oocyte. Orthologous to human PADI4 (peptidyl arginine deiminase 4). [provided by Alliance of Genome Resources, Apr 2022]