The mechanism by which neutrophil leucocytes exhibit chemotaxis continues to be the subject of debate. In recent articles in this journal (Vicker el al. 1986; Haston & Wilkinson, 1987) the question of whether neutrophils can perceive spatial attractant concentration gradients has been discussed. The purpose of this brief note is to give attention to some information that should help clarify some of the points raised by these articles.
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Lauffenburger et al. (1987) studied this question.
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