Which of the following is NOT true of interleukins? () A: They<br/>are cytokines which can be produced by various cells of the immune<br/>system. B: They<br/>are hormones which allow one cell to communicate with another cell. C: They<br/>are in need of receptors on the target cell in order to mediate their<br/>effects. D: They<br/>are able bind antigen with a high level of specificity. E: They<br/>are able to modulate various aspects of the B-cell arm of immune<br/>system.