Random locomotion; chemotaxis and chemokinesis. A guide to terms defining cell locomotion

There is still confusion about what is meant by widely used terms for cellular locomotion such as chemokinesis and random locomotion and how these are distinguished from chemotaxis. Also, most work on leukocyte locomotion up till now has been done with neutrophils, whose locomotion is easy to study in vitro, and is directed towards thefairly straightforward end ofaccumulation at sites of infection and tissue injury in vivo. In this article, Peter Wilkinson gives an outline of the classification of locomotor behaviour of cells(1) and of the end results expectedfrom each form of behaviour.