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Eduncle Best Answer
In SDS PAGE, SDS (denaturing agent) cleaves the 120kd multimeric protein into four subunits 2 X 20 kd + 2 X 40kd. However, Native PAGE doesn't separate the subunits of proteins, so it gives 120KD as total weight. Here the four subunits have different weights. So the native form of protein would be Heterotetramer.