LDH Isoenzymes & Gel electrophoresis

[arc5005]

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Can anyone explain to me why LDH is a tetramer and not a pentamer on the gel electrophoresis?

 

[pretty_positron]

You see three bands between the two extremes. One seems to be equidistant from the two extremes, which makes me think it's an even number. The ones between the extreme and the point in the center are also equidistant. This means you can halve it twice. Only 4 is a number presented that you can half twice.

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