The function of CCL17 (C-C motif chemokine ligand 17, Ensembl gene identifier ENSG00000102970) is as follows. Chemokine, which displays chemotactic activity for T lymphocytes, preferentially Th2 cells, but not monocytes or granulocytes. Therefore plays an important role in a wide range of inflammatory and immunological processes (PubMed:8702936, PubMed:9169480). Acts by binding to CCR4 at T-cell surface (PubMed:10540332, PubMed:9169480). Mediates GM-CSF/CSF2-driven pain and inflammation (PubMed:27525438). In the brain, required to maintain the typical, highly branched morphology of hippocampal microglia under homeostatic conditions. May be important for the appropriate adaptation of microglial morphology and synaptic plasticity to acute lipopolysaccharide (LPS)-induced neuroinflammation (By similarity). Plays a role in wound healing, mainly by inducing fibroblast migration into the wound (By similarity). {ECO:0000250|UniProtKB:Q9WUZ6, ECO:0000269|PubMed:10540332, ECO:0000269|PubMed:27525438, ECO:0000269|PubMed:8702936, ECO:0000269|PubMed:9169480}.