Neutrophil purification has traditionally been performed by centrifugation of leucocytes through density gradients. These reliable methods produce populations that are typically >95% pure neutrophils, and have allowed the widespread study of the function of these cells. Our recent work has suggested that residual monocytes may play a more important role than has been previously realized, and suggest that for some functional experiments, further purification of cells is required to understand fully the neutrophil phenotype.

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