For the isoleucine residues, a tendency is observed for the Cδ1 methyl groups attached to Cγ1 to be more mobile than those at Cγ2. Since the Cδ1 methyl groups are further away from the backbone than the Cγ2 methyl groups this increased mobility does not come as a surprise. It can be observed for I3 in the first β-strand with (Cγ2) = 0.67 ± 0.15 > (Cδ1) = 0.30 ± 0.19, I44 in the third β-strand with (Cγ2) = 1.25 ± 0.44 > (Cδ1) = 0.13 ± 0.06 and I61 in loop region with (Cγ2) = 0.72 ± 0.12 > (Cδ1) = 0.37 ± 0.18.