Some biological cells possess "tails" that protrude from the cell body and provide locomotive function to the cell. In this photomicrograph, a set of sensory neurons (whose cell bodies are faintly gray) also appears to possess these tails (black). It is not clear what the neurons use these tails for. An odd thing about the tails on this particular set of neurons is that instead of protruding from the cell body, they "whip" around and follow its contour. Consequently, until recently it was not known whether these cellular features actually existed, as they could not be distinguished from the cell body itself. This image was generated by antibody labeling.