Cytokines are a broad and loose category of small proteins that are important in cell signaling.
Their release has an effect on the behavior of cells around them. It can be said that cytokines are involved in autocrine signalling, paracrine signalling and endocrine signalling as immunomodulating agents. Their definite distinction from hormones is still part of ongoing research.
Cytokines include chemokines, interferons, interleukins and lymphokines.
Leucocytes are the cells of the immune system that are involved in protecting the body against infectious diseases and foreign invaders. All white blood cells are produced and derived from multipotent cells in the bone marrow.
Leucocytes are divided neutrophils, eosinophils, basophils, lymphocytes and monocytes.
The human immunodeficiency virus (HIV) is a lentivirus that causes infection and over time acquired immunodeficiency syndrome (AIDS).
HIV infects vital cells in the human immune system such as helper T cells, macrophages, and dendritic cells. HIV infection leads to low level of CD4+ T cells.
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