Concentration-distance profiles of ligand at low cell density.

<p>Ligand profiles computed as a function of distance at low cell density () for nM. The -values (s) are: a) 10; b) ; c) ; d) ; e) ; f) ; g) ; h) . These profiles are defined in the extracellular medium () and distance is defined as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0021786#pone-0021786-g005" target="_blank">Fig.5</a>. The corresponding 2D plots (not shown) viewed from the cell surface appear blue-red.