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A researcher is given the task of designing a protein that will bind to a receptor very well. The receptor's binding site has strong positive charges at the edges and negative charges in the center. How would you go about designing the protein to bind to it?
a) Contamination by laboratory workers handling the specimens b) That the ancient DNA might infect the archeologists. c) The degradation of the DNA by chemical damage over time d) The introduction of modern DNA onto the sample by archeologists in the field site.