Haemoglobin from horse red blood cells was purified, some was left to crystallize using different salt concentrations (top picture) and a sample was loaded on a polyacrylamide gel along with molecular weight markers. Sodium Dodacyl Sulfate - Polyacrylamide Gel Electrophoresis (SDS-PAGE) is a very useful technique for all bio-science researchers, giving relatively a lot of information about a protein (especially the 2-D gel).
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