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Hydropathy bar graph legend: Top is hydrophilic, bottom is hydrophobic, pink is acidic, neon green is aromatic, blue is basic, gray is aliphatic, dark green is polar, and yellow is cysteine. SARS-CoV: severe acute respiratory syndrome coronavirus, MERS-CoV: Middle East respiratory syndrome coronavirus, and SARS-CoV-2: severe acute respiratory syndrome coronavirus 2.
