One of a group of related proteins made by leukocytes (white blood cells) and other cells in the body. Lymphopoietin-1 is made by cells that cover and support organs, glands, and other structures in the body. It causes the growth of T lymphocytes and B lymphocytes. Lymphopoietin-1 made in the laboratory is used as a biological response modifier to boost the immune system in cancer therapy. Lymphopoietin-1 is a type of cytokine. Also called IL-7 and interleukin-7.