Figure 3From: Capillary-driven surface-enhanced Raman scattering (SERS)-based microfluidic chip for abrin detectionSDS-PAGE analysis of purified abrin. M, protein marker; 1, raw extract; 2, purified abrin by the first step; 3, purified abrin by the second step under nonreducing condition; 4, purified abrin by the second step under reducing condition.Back to article page