Snapshots of the farnesylated HVR/PDEδ complex for K-Ras4A (systems A1 and A2), K-Ras4B (systems B1 and B2), and N-Ras (systems N1 and N2) at the start, 100 ns, and 200 ns points. In the cartoon, green, blue, and orange tubes represent the K-Ras4A, K Ras4B, and N-Ras HVRs, respectively.