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Constructed free energy landscapes (FELs) of the two forms of gp120 using projections of eigenvectors 1 and 2 as the reaction coordinates. (A) FEL of the CD4-free gp120. (B) FEL of the CD4-complexed gp120. The color bar indicates the relative free energy value in kJ/mol. The basins/minima with free energy level lower than −13 kJ/mol are labelled “a” to “d” in (A) and “e” to “g” in (B).
