Table 2.

Chemotaxis analysis of Dictyostelium cells in a spatial folate gradient

Strain genotypeNo. of cellsMean ± SD
Instantaneous velocity (μm/min)Chemotaxis indexa
JH10 (wild type)3013.70 ± 0.930.90 ± 0.05
rasG316.85 ± 0.690.31 ± 0.05
rasC3211.78 ± 0.820.70 ± 0.06
rasC/rasG287.00 ± 0.750.06 ± 0.02
rasG/[rasG]rasD277.02 ± 0.640.32 ± 0.05
rasC/rasG/[rasG]rasD297.34 ± 0.760.07 ± 0.03
  • a The chemotaxis index was calculated as the net distance traveled toward the source of chemoattractant divided by the total distance traveled in that time period.