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Sulfo-TAG NHS ester (disodium) is an N-hydroxysuccinimide ester that can be coupled to proteins via primary amine groups. Sulfo-TAG NHS ester (disodium) can be used for antibody labeling[1].

[1] Kanghoon Lee, et al. Analysis of ocular fluid in patients with ranibizumab-recalcitrant neovascular age-related macular degeneration who have serum anti-ranibizumab antibodies. Graefes Arch Clin Exp Ophthalmol. 2023, 261, 12. DOI:10.1007/s00417-023-06146-6