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. 2015 Mar 2;5:8640. doi: 10.1038/srep08640

Figure 5. The second principal component from PCA for the apo system.

Figure 5

The helices were labeled in one monomer. The direction along the eigenvector was demonstrated by the arrow with both positive and negative direction labels. The negative movement along this principal component contains a downward sliding motion of the α4 helices from blue to pink.