Figure 8.
Lipidated probes move through the connecting cilium via impeded diffusion. (A and C) Time course images of PAGFP or Far0-PAGFP flux into the IS. Vertical lines indicate the OS–IS junction. At time zero, PAGFP was activated by two photon scanning over 70–80% of the OS. ROIs were drawn to find cOS (ROI1), cIS (ROI2); and MIS (ROI3; Eq. 1). Scale bars, 10 µm. (B and D) Flux normalized to OS–IS concentration gradient (grad [OS-IS]). Line is linear regression. DCC was estimated according to Eq. 1. (E) Average DCCs; error bars: SEM. Asterisk indicates DCC of PAGFP was significantly higher than those of the lipidated probes at P = 0.05, as determined by two-tailed t test.