“…Protozoa are ideal models ; being single‐celled eukaryotic heterotrophs, they are physiologically animal‐like, but they are not animals and, therefore, not subject to concerns associated with animal testing. Among protozoa, ciliates are the most frequently employed taxa in toxicological studies, undoubtedly as they represent good animal and human models for a range of toxins , including those associated with skin compatibility of textiles . To date, swimming patterns of the model ciliate Tetrahymena thermophila have been used to assess ocular irritancy .…”