6N9T:
reference: Development, optimization and structural characterization of an efficient peptide-based photoaffinity crosslinking reaction for generation of homogeneous conjugates from wild-type antibodies., Sadowsky J, Vance N, Zacharias N, Ultsch M, Li G, Fourie A, Liu P, Lafrance-Vanasse J, Ernst JA, Sandoval W, Kozak KR, Lewis-Phillips GD, Wang W, Bioconjug Chem. 2018 Dec 19. doi: 10.1021/acs.bioconjchem.8b00809. PMID: 30566343

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