passages.id: split_6_test_3022_passage
passages.type: progene_text
passages.text: To elucidate the biological significance of the lactosylceramide ( LacCer ) branching in glycosphingolipid ( GSL ) biosynthesis , we established ganglioside GM3 - and lactosylsulfatide SM3 - reconstituted cells by introducing the GM3 synthase gene and the sulfotransferase gene , respectively .