Here is the sequence logo predicted by the SAM server:

H = helix
E = sheet
C = loop (or coil)

The taller the letter at each position, the higher the probability of that specific secondary structure for that amino acid.

Note that these secondary structure predictions are not necessarily present in the server models that have been provided in the puzzle.
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If you are a new Foldit player, please make sure you have completed all these tutorials before trying this puzzle:
- lonely sheets,
- lock and lower,
- rebuild,
- structure and rebuild,
- control over clashing.

pls :D

It just seemed that it might be a dimer (or more) based on a couple of the models and the positions of the large exposed surfaces.