Keywords: nanocarbon film electrode; tryptophan metabolites; kynurenine pathway EN nanocarbon film electrode tryptophan metabolites kynurenine pathway 1 1 1 04/07/22 20220401 NES 220401 The cover image is based on the Research Article I Electrochemical Detection of Tryptophan Metabolites via Kynurenine Pathway by Using Nanocarbon Films i by Dai Kato et al., DOI: 10.1002/elan.202100241, which is part of the Special Collection on Electroanalysis Based on Carbon Nanomaterials. Nanocarbon film electrode, tryptophan metabolites, kynurenine pathway.