Partial dynamic electrophoretic fingerprint of trimeric (A) influenza HA and (B) HIV-1 BX08 gp140. Electrophoretic mobility was measured at 13 pH values ranging from 3.0 to 9.0 in 154 mM NaCl. Bolded lines show the line of zero electrophoretic mobility. Data was collected for three titrations, and three measurements were made and averaged at each titration point (n = 9 per titration point). Data were plotted using direct linear interpolation.