XCL1 and infection: Lymphotactin (XCL1) – a member of the least examined C class of chemokines (Kelner et al., 1994) – is produced by subsets of T cells and natural killer cells in response to infection and inflammation, and is chemotactic for T lymphocytes through binding to its receptor (XCR1) (Huang et al., 2001, Dorner et al., 2002, Lei and Takahama, 2012).