If you're working with a pure protein, give the most likely explanation of why; your sedimentation equilibrium experiment gives a MW of 160,000 Da for an intact protein.
I'm confused in part because this is the first time I'm ever hearing about said experiment. But from what I read, this experiment is very reliable when it comes to MW's of a protein. So the likely explanation of why the MW is 160,000 Da is because it's MW is exactly that or close too 160,000 Da...? That as an answer sounds redundant to me.