The presence of sialic acid on two related bacterial polysaccharides determines the site of the primary immune response and the effect of complement depletion on the response in mice.
Markham RB, Nicholson-Weller A, Schiffman G, Kasper DL. The presence of sialic acid on two related bacterial polysaccharides determines the site of the primary immune response and the effect of complement depletion on the response in mice. J Immunol. 1982 Jun; 128(6):2731-3.