Interferon secreted by leukocytes, fibroblasts, or lymphoblasts in response to viruses or interferon inducers other than mitogens, antigens, or allo-antigens. They include alpha- and beta-interferons (INTERFERON-ALPHA and INTERFERON-BETA).

Synonyms: 0, Interferons, Type I, Type I Interferon, Interferon, Type I, Type I Interferons, Interferon Type I, Interferons Type I