1XHB:
reference: The beginnings of mucin biosynthesis: the crystal structure of UDP-GalNAc:polypeptide alpha-N-acetylgalactosaminyltransferase-T1., Fritz TA, Hurley JH, Trinh LB, Shiloach J, Tabak LA, Proc Natl Acad Sci U S A 2004 Oct 26;101(43):15307-12. Epub 2004 Oct 14. PMID: 15486088

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