Cell migration patterns. In the absence of an external signal (e. g chemoattractant gradient). the mi gration pattern resembles a random walk Microvessel endothelial cells · Fibroblasts 9s900o 101 ⊥ mmm mm tm n Speed (um·miny) 100120140160180200220 X-position(μm) Migration speed tends to vary Inversely with persistence time.Cell migration patterns. In the absence of an external signal (e.g., chemoattractant gradient), the migration pattern resembles a random walk. Migration speed tends to vary inversely with persistence time