27 . Wu , Z , Miller , E , Agbandje - McKenna , M and Samulski , RJ ( 2006 ) . Alpha 2 , 3 and alpha 2 , 6 N - linked sialic acids facilitate efficient binding and transduction by adeno - associated virus types 1 and 6 . J . Virol . 80 : 9093 - 103 .