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Mean chemotaxis index, <CI>, over time for SC migrating in response to the concentration of RGD and YIGSR medium gradients, and YIGSR steep gradient. CI was determined by averaging the chemotaxis index obtained from at least 30 cells at each time point. Overall, cells on YIGSR gradients travelled more consistently in the direction of the gradient represented by the higher <CI>, and this distance, compared to the total travelled distance, increased as the gradient steepness increased.
