Fig. 4.

Differential staining with GLUT2 immunostain of pancreatic islet cells from New and Old World primates. A–C: positive staining in cynomolgus macaques, rhesus macaques, and vervet monkeys, respectively. Inset in B: staining in aged rhesus macaque, with less staining intensity than in young adult macaque in main image. D, E, F, and G: negative staining results in common marmosets, owl monkeys, squirrel monkeys, and cotton-top tamarins, respectively. Note less intense staining in vervet than in rhesus or cynomolgus islet cells.