When other vaccinia viruses come knocking, long projections of another protein, actin, shoot out from the cell membrane, causing the virus to bounce off. (sciencemag.org)
Nerve cells, or neurons, that produce the chemical messenger molecule serotonin extend long projections called axons to various parts of the brain. (sciencenews.org)
Neurons are highly specialized cells with very long projections called axons, which they use to communicate with one another. (ellisonfoundation.org)