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SDS-PAGE of the purified GST isoenzymes (5 μg) (lanes 2 and 3) and protein markers (3.6 μg per band) (lanes 1 and 4) stained with Coomassie blue. Markers from top to bottom are bovine albumin (66 kDa), egg albumin (45 kDa), glyceraldehyde-3-phosphate dehydrogenase (36 kDa), carbonic anhydrase (29 kDa), bovine pancreatic trypsinogen (24 kDa), soybean trypsin inhibitor (20.1 kDa), and bovine milk α-lactalbumin (14.2 kDa).
