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\section{Conclusion}  The Anisotropy imaging is commonly used in biochemical applications to provide information on the  size and shape of proteins, as well as the viscosity  of their surrounding environment. We have shown that  the hydrodynamic radii of anti-VEGF  proteins ranibizumab, aflibercept and bevacizumab  can be measured accurately using anisotropy and the Ru dye as a label. The measured anisotropies are double-exponentials, with a long component caused by the rotation of the protein, and a short component probably due to the dye rotating on its bond. The measurement of well-characterised protein BSA as a test confirms the validity of this approach. The experimentalBSA and Eylea  radii for BSA, ranibizumab, aflibercept and bevacizumab  are in good agreement with the radii calculated from molecular weight and other experimental measurements.