Article 1 Organisation for Economic Co-operation and Development 1 biological marker 1 borderline range 1 cell assay 1 cell differentiation 1 cell viability 1 cinnamaldehyde 1 cutoff 1 data analysis 1 decision tree 1 defined approach 1 direct peptide reactivity assay 1 follow up 1 high performance liquid chromatography 1 human 1 human cell 1 human cell line activation test 1 in vitro study 1 keratinosens kinetic direct peptide reactivity assay 1 lusens 1 oxidative stress 1 practice guideline 1 prediction 1 prediction model 1 skin sensitization 1 toxicology 1 uncertainty 1