Table 1.

Incidence of stone formation in Drosophila Malpighian tubules in 3 experimental conditions

Drosophila diet	Overall incidence of crystal formation (%)
control	20 ± 2.2
0.05% sodium oxalate	73 ± 3.6
0.5% ethylene glycol	84 ± 2.2

Values were expressed as means ± standard error of mean