This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionAntigen presentation.jpg
Antigen presentation stimulates T cells to become either "cytotoxic" CD8+ cells or "helper" CD4+ cells. Cytotoxic cells directly attack other cells carrying certain foreign or abnormal molecules on their surfaces. Helper T cells, or Th cells, coordinate immune responses by communicating with other cells. In most cases, T cells only recognize an antigen if it is carried on the surface of a cell by one of the body’s own MHC, or major histocompatibility complex, molecules.
Date
NIH Publication No. 03–5423, September 2003 (modifications: September 4, 2006)
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
Public domainPublic domainfalsefalse
This work has been released into the public domain by its author, DO11.10. This applies worldwide.
In some countries this may not be legally possible; if so: DO11.10 grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
{{Information| |Description= |Source=http://www.niaid.nih.gov/publication/immune/the _immune_system.pdf |Date=September 4, 2006 |Author=Template drawing from "The Imune System", any modifcations, made by myself are released into the public domain |Permiss