Hemagglutinating activity of rCG13321. (A) A 5% (v/v) rabbit erythrocyte suspension in TBS was mixed with LA and HA solutions in TBS and incubated for 1 h. The cells spread over the bottom of the microtiter plate wells indicate hemagglutination caused by binding of the proteins at multiple sites. (B) Competitive inhibition of hemagglutination by monosaccharides. The wells showing inhibition of hemagglutination are enclosed in blue boxes. The final concentrations of proteins and monosaccharides are indicated above the wells.