FIG. 6.
Inhibition of proteolytic digestion of purified HA by CL 61917 and CL 385319. Proteinase (Prot.) K digestion of HA purified from either wt or 61917r-A virus was performed as described in the text. The concentrations of the CL compounds are indicated, as is the pH to which the HA was exposed prior to proteolysis.