Glutamine is a vital fuel for rapidly dividing cells. Which of the following statements best describes one of these cell types that utilizes glutamine as an energy source?

• A. It is primarily a signaling molecule for appetite suppression.
• B. It serves as a vital fuel for rapidly dividing cells such as enterocytes, fibroblasts, reticuloendothelial cells and malignant cells.
• C. It functions as the main energy source for red blood cells.
• D. It is an essential vitamin.

Answer: (B)