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In cell biology, CD11 is the α (alpha) component of various integrins, especially ones in which the β (beta) component is CD18 (β2) and mediate leukocyte adhesion. ^[1] For example,

• LFA1 ( CD11a/ CD18) short representation of Lymphocyte Function-associated Antigen 1, also called α_Lβ₂ integrin
• Mac1 ( CD11b/ CD18) present on macrophages that is also called Macrophage-1 antigen (CR3) and α_Mβ₂ integrin.
• CD11c/ CD18 also called complement receptor 4 (CR4) and α_Xβ₂ integrin.

References

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