Before revision: The differences in the polarity of collectively migrating cell groups are due to the features of expression of surface receptors, such as CXCR4 and CXCR7 chemokine receptors, in the “leader” cells.
After revision: The differences in the polarity of collectively migrating cell groups are due to the expression of surface receptors, such as CXCR4 and CXCR7 chemokine receptors, in the “leader” cells.