Immunogen sequence: VGKLETLDED AAQLLQLLQV DRQLRFPPSY RNRTASSWEE DWFAKIPLAW RQQLYKLYEA DFVLFGYPKP ENLLRD Highest antigen sequence identity to the following orthologs: Mouse - 92%, Rat - 92%. Catalyzes the transfer of sulfate to position 4 of the N-acetylg