Table 1. Memory of position and polarity axis in Dictyostelium mutants and other species.
| Strain | Memory Position | Memory Polarity-axis | Effect of memory | |||
|---|---|---|---|---|---|---|
| alternating left-right (%LR) | pseudopods in front (%F) | Persistent steps (# pseudopods) | ||||
| Dictyostelium | ||||||
| Starved WT | 77±4 | 86±6 | 14.9±1.0 | |||
| Vegetative WT | 74±2 | ns | 55±7 | * | 5.7±1.6 | * |
| Starved sgc/gca-null | 72±5 | ns | 41±6 | * | 9.1±1.9 | * |
| Starved gbpC-null | 75±4 | ns | 51±7 | * | 9.7±1.1 | * |
| Starved myoII-null | 73±3 | ns | 64±7 | * | 5.2±1.9 | * |
| Starved forAEH-null and racE-null | 75±4 | ns | 33±3 | * | 5.7±2.2 | * |
| Starved Rap1G12V | 76±3 | ns | 32±4 | * | nd | |
| Starved SCAR-SD | 56±5 | * | 84±5 | ns | 8.6±1.0 | * |
| Vegetative SCAR-SD | 56±3 | * | 55±3 | * | 1.4±0.4 | *, ** |
| Neutrophils | 74±5 | ns | 87±2 | ns | 13.2±1.6 | ns |
| Mesenchymal stem cells | 79±5 | ns | 86±3 | ns | 16.0±2.6 | ns |
| B.d. chytrid | 78±2 | ns | 89±4 | ns | 14.7±0.6 | ns |
| Expected if no memory | 50 to 60% | 30 to 40% | 1 | |||
| (see S3 Fig) | (size of front; Fig 1E) | |||||
Data for memory of position and memory of polarity axis are the means and SEM; n = 28 cells for starved wild-type (WT), and n = 8 cells for others. Data for effect of memory are the optimal fit and 95% CI from S4 Fig and S1 Table. ns, not significant at P>0.05
*, significantly different from starved WT at P<0.01
**, significantly different from starved SCAR-SD at P<0.01; nd, not determined because cells do not displace.