Before revision:  To distinguish between  chemotactic approach and blind migration, we present an objective method that is based on the analysis of time-lapse recorded cell migration trajectories : For each movement of a cell relative to the position of potential targets, we compute a p-value that quantifies how likely the direction of this movement step is under the null-hypothesis of blind migration.
After revision:  To distinguish between the chemotactic approach and blind migration, we present an objective method that is based on the analysis of time-lapse recorded cell migration trajectories : For each movement of a cell relative to the position of potential targets, we compute a p-value that quantifies how likely the direction of this movement step is under the null-hypothesis of blind migration.