A colorimetric sensor based on the M13 bacteriophage (phage) is used for identifying and classifying endocrine disrupting chemicals, including phthalate and chlorobenzene derivatives. Arrays of structurally and genetically modified M13 bacteriophage were fabricated so as to produce a biomimetic colorimetric sensor. The characteristic color patterns obtained on exposure to various benzene derivatives enabled the successful classification of molecules with similar chemical structures in the vapor phase. More information can be found in the Full Paper by Jin-Woo Oh et al. on page 3097 in Issue 21, 2016 (DOI: 10.1002/asia.201601079).