Cytokines are: ΟΑ. .
Viruses that attack cancer cells
OB.
Drugs that alter immune responses
O C. Drugs that make cancer cells visible to the immune system
OD. Signaling proteins produced by white blood cells

The model illustrates a process by which a substance is taken up by a cell. which statements describe the process? a. the model shows the process of endocytosis. b. the process shown in the model requires energy from the cell. c. the cell membrane in the model remains intact throughout the process. d. the model shows the process of facilitated diffusion.