This displacement of chemoattractant by the cells is quite significant in case (ii) as the chemoattractant concentration becomes higher than \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$q_\mathrm{{initial}}$$\end{document} as a result of cell movement.
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