Puzzle 1640: Unsolved De-novo Freestyle 147: Symmetric Dimer

This puzzle is a follow-on to Puzzle 1637, which featured the same protein as monomer. This protein is designed, possibly by a Foldit player.

<gallery> irc_476462_1551398490 S1 LociOilikng 17514.png|S1 LociOiling 17514 irc_352715_1551395533 G2 Anthropic Dreams E1 Galaxie 17512.png|G2 Anthropic Dreams E1 Galaxie 17512 </gallery

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