Enables vitamin D binding activity. Involved in several processes, including female pregnancy; lactation; and response to estradiol. Located in several cellular components, including axon; extracellular space; and perinuclear region of cytoplasm. Biomarker of brain ischemia and hepatocellular carcinoma. Human ortholog(s) of this gene implicated in several diseases, including autoimmune disease (multiple); chronic obstructive pulmonary disease; hepatocellular carcinoma; human immunodeficiency virus infectious disease; and rheumatic fever. Orthologous to human GC (GC vitamin D binding protein). [provided by Alliance of Genome Resources, Apr 2022]