Fig 1. Cilia are sensory organelles that are found in multiple species and are present on nearly all cell types in mammals.

Schematics of cilia/flagella (green) in the ciliated protozoa Tetrahymena (A), the alga Chlamydomonas (B), the Caenorhabditis elegans sensory neuron ADL (C), a mammalian rod photoreceptor (D), a mammalian hypothalamic neuron (E), and a mammalian airway epithelial cell (F). Drawings are not to scale. Drawing by Julian Eskin.