Microbiology Immunology 208fd019 IL-1 is produced by - A Macrophage B Helper T lymphocytes C B cells D Cytotoxic T-cells High-Yield Explanation It is principally secreted by macrophages and monocytes but can be produced by most other nucleated cells as well REF:Ananthanarayan & Panikers Textbook of Microbiology 9th Edition pg:154