Which of the following statements is true about cytokines?

Cytokines are crucial signaling molecules that play a significant role in the immune system by regulating immune cell communication. They are produced by various cells, including immune cells like macrophages, T cells, and dendritic cells, and they help coordinate the body's response to infections and injuries. By facilitating communication between different types of immune cells, cytokines ensure that an appropriate immune response is mounted, allowing the body to effectively fight pathogens and maintain homeostasis.

The other options do not accurately describe cytokines. For instance, cytokines can promote immune responses rather than inhibit them, can be produced by a diverse range of cell types, and are not responsible for storing genetic information.