Before revision:  A strong correlation between the tumbling of the protein and the transitions of the X4 and X5 dihedral angles of the MTSL , was observed with a consequent effect also the distribution of the nitroxide (NO) group in the space .
After revision:  A strong correlation between the tumbling of the protein and the transitions of the X4 and X5 dihedral angles of the MTSL was observed with a consequent effect also the distribution of the nitroxide (NO) group in the space .