Fig. 4. itpr rescues the transport phenotype of the itpr^90B.0 allele. Fluid transport assays were performed on the hsGAL4;itpr^90B.0 line. The data show that CAP_2b-stimulated fluid transport is decreased in this line. Rescue of hsGAL4;itpr^90B.0 with UAS-itpr results in wild-type levels of stimulated fluid transport. Fluid secretion rates were measured for 30 min prior to addition of neuropeptide (arrow), after which measurements were taken for a further 30 min. Data are expressed as mean fluid secretion rates (nl min^-1) ± S.E.M. (N=6-10). UAS-itpr tubules display similar secretion rates to those of wild-type tubules (data not shown).