Fig. 2From: Novel bispecific aptamer targeting PD-1 and nucleolin for cancer immunotherapyAgarose gel electrophoresis for verifying the formation of BiApt. The lane on the far left is a 50 bp DNA ladder. Lanes 1–3 represent images of S1 chain, S2 chain, and the mixture of S1 and S2 chains, respectivelyBack to article page