CCR2 and infection: The distribution of the ligands and receptors revealed that the CCL4-CCR5 and CCL5-CCR5 signaling pathways were mainly present in the livers of the mice at 6 w after infection; the CCL4-CCR5 and CCL6-CCR2 signaling pathways were predominant after 10 w of infection (Supplementary Figure S3A).