Page 232 - Veterinary Immunology, 10th Edition
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                              FIG. 8.8  The major types of cytokine receptors. In all cases,
                              protein kinases are activated by ligand binding. For example,
                            growth factor receptors associate in the presence of their ligand to
                                form a dimer. This brings the two tyrosine kinases on the
                             cytoplasmic domains close together. The enzymes then activate
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