Research Article

High Expression and Purification of Amino-Terminal Fragment of Human Amyloid Precursor Protein in Pichia pastoris and Partial Analysis of Its Properties

Figure 5

SDS-PAGE analysis of stability of the purified protein. M: protein marker; lane 1, 2: purified protein by Q Sepharose fast flow chromatography; lane 3: the purified protein by Q Sepharose fast flow chromatography which was incubated at 4°C for 4 d; lane 4: the purified protein by Q Sepharose fast flow chromatography which was incubated at 20°C for 4 d.
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