From my research, I found that SDS gels do not break covalent interactions. So how can you say that C is valid in this case? I see what they are trying to say---since the variant in Gel A (the SDS gel) has a band at a lower MW than the variant well in Gel B (native gel), this means that the variant contains multiple subunits which were broken apart by the SDS. However, I thought non-reducing SDS was only able to break non-covalent bonds.
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