Imagine the main chain of a protein bends back on itself, so that two amino acid residues R, and R, come close to each other. In the table below are four possibilities for what R, and R, might be. In each case, decide whether a specific interaction could form between the residues. If a specific interaction could form, give the name of the interaction. R₁ cysteine serine serine valine R₂ cysteine alanine asparagine phenylalanine specific interaction? O yes O no O yes O no O yes O no O yes O no name of specific interaction 0 0 0 0

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