Fig. 4From: Novel bispecific aptamer targeting PD-1 and nucleolin for cancer immunotherapySerum stability of BiApt with or without phosphorothioate modification. A Electrophoresis of BiApt after incubation in PBS supplemented with 50% FBS for various times (N: unmodified BiApt; P: phosphorothioate-modified BiApt). B Quantitative gray-scale values of the DNA complexes were obtained by Image J software (n = 3, mean + SEM)Back to article page