FIG. 6.

Role of sialic acid in the interaction of influenza virus glycoproteins with the MR. Peritoneal Mφ were incubated with V. cholerae type III NA (▨) or in medium alone (mock treated) (■) for 60 min at 37°C, washed, and used in binding assays with ¹²⁵I-BJx109 HANA (A) and ¹²⁵I-mBSA (B). Specific binding of ¹²⁵I-mBSA was determined in the absence or presence of 10 μg of unlabeled BJx109 HANA per ml. Results are expressed as mean cpm bound (and 1 standard error) from triplicate samples and are from one of two similar experiments.