Five cytokine receptor families Immunoglobulin superfamily receptors Class I cytokine receptor family (hematopoietin receptors) Binds most of the cytokines in the immune and hematopoietin systems Class II cytokine receptor family TNF receptor family Chemokine receptor family Five cytokine receptor families ◼ Immunoglobulin superfamily receptors ◼ Class I cytokine receptor family (hematopoietin receptors) ◼ Binds most of the cytokines in the immune and hematopoietin systems ◼ Class II cytokine receptor family ◼ TNF receptor family ◼ Chemokine receptor family