A measurement, which has been normalized, adjusted or derived by a mathematical process or computation, of the weight (the heaviness or the force with which an object is drawn toward the earth by gravity) of the islet beta cells in the tail region of the pancreas (that is, the portion of the pancreas which lies furthest from the major pancreatic duct and closest to the spleen, the highly vascular lymphoid organ which serves to store blood, disintegrate old blood cells, filter foreign substances from the blood, and produce lymphocytes). The pancreas is the elongated, racemose gland containing both endocrine and exocrine elements which secretes hormones such as insulin and glucagon internally and digestive enzymes externally. A pancreatic islet is a small encapsulated region of the pancreas containing endocrine (i.e., hormone-producing) cells. An islet beta cell is a membrane-enclosed protoplasmic mass constituting the smallest structural unit of an organism that is capable of independent functioning, which is found in a pancreatic islet and produces the hormones insulin and amylin.