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A cilium is an organelle found in eukaryotic cells. Cilia are thick protuberances that project from the much larger cell body. There are two types of cilia: motile cilia and non-motile, or primary cilia, which typically serve as sensory organelles. In eukaryotes, motile cilia and flagella together make up a group of organelles known as undulipodia. Eukaryotic cilia are structurally identical to eukaryotic flagella, although distinctions are sometimes made according to function and length. In humans, primary cilia are found on nearly every cell in the body. Cilia usually occur one per cell; nearly all mammalian cells have a single non-motile primary cilium. In addition, examples of specialized primary cilia can be found in human sensory organs such as the eye and the nose. Some primary cilia provide chemo-sensation, thermo-sensation, and mechano-sensation