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Dynorphin B (1-9) is a neuropeptide and N-terminal cleavage product of dynorphin B. The formation of dynorphin B (1-9) is blocked by N-ethylmaleimide (NEM), a non-selective inhibitor of cysteine peptidases[1].

[1] Bivehed E, et al. Region-specific bioconversion of dynorphin neuropeptide detected by in situ histochemistry and MALDI imaging mass spectrometry. Peptides. 2017;87:20-27. DOI:10.1016/j.peptides.2016.11.006