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a, Overview and timeline of the protocol. b, SDS-PAGE gel of recombinant spike after elution from the Strep-Tactin column. c, Superose-6 traces of S-2P and HexaPro. Note the higher yield for HexaPro. d, Differential scanning fluorimetry analysis. e, A negative-stain electron micrograph. f, 2D class averages of HexaPro.
