The amino acid sequence of Gal3ST-4 revealed 33%, 39%, and 30% identity to human Gal3ST-1, Gal beta 1-->3/4GlcNAc:-->3'-sulfotransferase (Gal3ST-2) and Gal beta 1-->4GlcNAc:-->3'-sulfotransferase (Gal3ST-3), respectively.