SLC2A4, also known as the glucose transporter type 4 (GLUT4), is a protein that plays a crucial role in regulating glucose levels in the body. It is primarily found in adipose tissue (fat) and muscle cells, where it facilitates the uptake of glucose from the bloodstream into these cells, especially after eating. The activity of SLC2A4 is influenced by the hormone insulin. When insulin is released, it signals cells to increase the number of GLUT4 transporters on their surface, enhancing glucose absorption. This process is vital for maintaining normal blood sugar levels and overall metabolic health.