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Two-dimensional free-energy surface of SMS1 in complex with (a) ceramide, (b) ceramide 2R hydroxylated, (c) ceramide 2S hydroxylated; SMS2 in complex with (d) ceramide, (e) ceramide 2R hydroxylated, (f) ceramide 2S hydroxylated. The CV1 and CV2 are the x- and y-axis, respectively.
