Enables C-X3-C chemokine receptor activity. Involved in several processes, including negative regulation of apoptotic process; regulation of cell migration; and regulation of gene expression. Located in several cellular components, including cell surface; neuronal cell body membrane; and perinuclear region of cytoplasm. Used to study Parkinsonism; glomerulonephritis; hepatopulmonary syndrome; and status epilepticus. Biomarker of several diseases, including anti-basement membrane glomerulonephritis; artery disease (multiple); borna disease; portal hypertension; and sciatic neuropathy. Human ortholog(s) of this gene implicated in several diseases, including human immunodeficiency virus infectious disease; obesity; pulmonary hypertension; retinal disease (multiple); and systemic scleroderma. Orthologous to human CX3CR1 (C-X3-C motif chemokine receptor 1). [provided by Alliance of Genome Resources, Apr 2022]