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PADI2, also named as KIAA0994, PDI2, PAD-H19 and PAD2(Peptidylarginine deiminase II ), belongs to the protein arginine deiminase family. It catalyzes the deimination of arginine residues of proteins. PADI2 may play a regulatory role in the expression of lactation related genes via histone citrullination during diestrus (PMID:20668670). PADI2 has two isoforms with MW 75 kDa and 49 kDa.