When investigating migration and chemotaxis of leukocytes under agarose polyvinylpyrrolidone (PVP; 11 kg/mol) and polyethyleneglycol (PEG; 6 kg/mol) were used instead of serum. The highest migration was detected with 0.5-1 mm of PVP. Phagocytosis was not influenced either by PVP or PEG within a concentration range of 0.01-1 mm.
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