In one fly model of TTR-amyloidosis, Pokrzywa et al. used GMR-Gal4 driver and found an accumulation of non-membrane-encircled nano-granules in both retinal and glial cells in flies expressing either the wild type TTR or the double mutant TTR (TTRV14N/V16E). The gene discussed is TTR; the disease is amyloidosis.