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The PX-JX2 device is embedded into a five-helix motif. a and b show the two conformations. c schematizes the five helices as squares, including a green sticky end for JX and a purple one for PX, and also shows the protecting DX (yellow). d shows four possible TX middle domains, with sticky ends drawn colored. e shows four different middle domains paired to programmable pawns with the same coloration.
