CCL5 and Anxiety: FMT from healthy human GM significantly reduced anxiety-like repetitive behaviors and raised serum levels of chemokines, including GRO-1 (CXCL1), MRIP-1 (CCL3), MCP-3 (CCL7), Eotaxin (CCL11) and RANTES (CCL5) which are crucial for neurogenesis and synaptic transmission in the central nervous system, in ASD mice (166).