Skip to main content
. Author manuscript; available in PMC: 2010 Aug 1.
Published in final edited form as: Cell Motil Cytoskeleton. 2009 Aug;66(8):567–587. doi: 10.1002/cm.20367

Figure 7.

Figure 7

Extracellular potassium substitutes for extracellular calcium in the presence of a spatial gradient of cAMP. A through D. A comparison of the effects of the buffered salt solution BSS, and TB containing 0 and 20 mM CaCl2, 20, 40 and 60 mM KCl and 20 mM NaCl2. The main cation in BSS is 40 mM K+, it contains no added Ca++. E through H. A comparison of the effects of divalent cations on behavior and chemotaxis. With the exception of BSS, all test solutions but BSS contained TB plus the noted concentration of each monovalent or divalent cation. I through L. Analysis of the effects of pH. pH was adjusted in TB buffer in the presence of 10 mM CaCl2. Cells were analyzed in a spatial gradient of cAMP. Error bars represent standard deviations of the means.