... Chandrasekaran A, Srinivasan A, Raman R, Viswana-than K, Raguram S, Tumpey TM, Sasisekharan V &Sasisekharan R (2008) Glycan topology determineshuman adaptation of avian H5N1 virus hemagglutinin.Nat ... hemagglutinin.Nat Biotechnol 26, 107–113.10 Srinivasan A, Viswanathan K, Raman R, Chandraseka-ran A, Raguram S, Tumpey TM, Sasisekharan V &Sasisekharan R (2008) Quantitative biochemical ratio-nale ... moieties, leaving intact a2 fi 6 linkedsialic acid, and sialidase A [22], which cleaves a2 fi 3, a2 fi 6, and a2 fi 8 linked sialic acids. In combinationwith MALDI-MS analysis, enzymatic treatment wasused...