2673368 EXT1 exostosin 1 56 2673372 EXT1 exostosin glycosyltransferase 1 20 2673369 EXT1 exostoses chromosomal loci 8q24.1 1 2673375 EXT1 Exostoses-1 gene 1 2673370 EXT1 exostosin-1 mutation 1 2673371 EXT1 exostosis type 1 gene 1 2673376 EXT1 EXT genes, 8q24.1 1 2673373 EXT1 extensin-1-like 1 2673374 EXT1 extension enzymes exostosin 1 1