Asp-Asp-Asp-Asp-Asp-Asp is a polyaspartic acid. The specificity of the catalytic and antigenic sites of influenza virus neuraminidase is related to the number of specific amino acids.
References:
[1]. Colman PM, et al. Structure of the catalytic and antigenic sites in influenza virus neuraminidase. Nature. 1983 May 5-11;303(5912):41-4.
















