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==White blood cells==
{{main|Leukocyte}}
{{See also|Nonspecific immune cell#Cells of the
[[File:SEM blood cells.jpg|thumb|right|230px|A [[scanning electron microscope]] image of normal circulating human blood. One can see red blood cells, several knobby white blood cells including [[#Cells of the Adaptive Immune System|lymphocytes]], a [[#Macrophages|monocyte]], a [[#Neutrophils|neutrophil]], and many small disc-shape [[platelet]]s.]]
White blood cells (WBCs) are also known as [[leukocyte]]s. Most leukocytes differ from other cells of the body in that they are not tightly associated with a particular organ or tissue; thus, their function is similar to that of independent, single-cell organisms. Most leukocytes are able to move freely and interact with and capture cellular debris, foreign particles, and invading microorganisms (although [[macrophage]]s, [[mast cell]]s, and [[dendritic cell]]s are less mobile). Unlike many other cells, most innate immune leukocytes cannot divide or reproduce on their own, but are the products of multipotent [[hematopoietic stem cell]]s present in [[bone marrow]].<ref name="Monga">{{cite journal | vauthors = Monga I, Kaur K, Dhanda S| title = Revisiting hematopoiesis: applications of the bulk and single-cell transcriptomics dissecting transcriptional heterogeneity in hematopoietic stem cells | journal = Briefings in Functional Genomics | volume = 21 | issue = 3 | pages = 159–176 | date = March 2022 | pmid = 35265979 | doi = 10.1093/bfgp/elac002}}</ref><ref name="Alberts">{{cite book| vauthors =Alberts B, Johnson A, Lewis J, Raff M, Roberts K, Walters P| title = Molecular Biology of the Cell | edition = Fourth | url = https://www.ncbi.nlm.nih.gov/books/bv.fcgi?call=bv.View..ShowTOC&rid=mboc4.TOC&depth=2| year = 2002| publisher = Garland Science| ___location = New York and London| isbn = 0815332181 }}</ref>
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