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Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
Pairings of biotinylated nanobodies as capture (biotinx-XX-Fc) and probe (YY-Fc-HRP) with Spike protein. The signal was produced by the reaction of HRP with TMB.