لانگر is a term that can refer to various subjects, but it is often associated with the Langerhans cells, which are specialized immune cells found in the skin and other tissues. These cells play a crucial role in the body's immune response by detecting and responding to pathogens. They are named after the German physician Paul Langerhans, who discovered them in 1868. In a different context, "لانگر" may also refer to the Langerhans islets, which are clusters of cells in the pancreas responsible for producing hormones like insulin. These islets are essential for regulating blood sugar levels and maintaining overall metabolic health.