| The PCD phenotype results from axonemal abnormalities and dysfunction of motile cilia and flagella. |
| The planulae of most cnidarians attach and lose, at most, a coat of swimming cilia. |
| The luminal surface of the epithelial cells contained few irregular cytoplasmic projections, but cilia or microvilli were absent. |
| The immotile cilia lack the motor protein dynein, which is essential for their movement. |
| Ectopic cilia are particularly irritating and likely to cause corneal ulcers. |
| Some single-celled organisms called protists do in fact use cilia on their cell surface to swim through water. |
