Microscopy images were acquired using a custom-built epi-illuminated wide-field fluorescence microscope operated by a MicroManager software interface (μManager, MicroManager 1.4, www.micromanager.org ; Edelstein et al. 2014 ) and built around an inverted microscope body (Eclipse Ti; Nikon, Amsterdam, Netherlands) fitted with a 60× water-immersion objective (CFI Plan Apo IR 60× water immersion, numerical aperture 1.27; Nikon). Excitation light was provided by a diode-pumped solid-state laser (Calypso 50, 491 nm; Cobolt, Solna, Sweden). Images were captured with an electron-multiplying charge-coupled device camera (iXon 897; Andor, Belfast, UK). One camera pixel corresponded to 92 nm × 92 nm in the image plane.
The C. elegans strain expressing EGFP-tagged OSM-3 kinesin motor proteins (Snow et al. 2004 (link)) was a kind gift of Jonathan M. Scholey (University of California, Davis, Davis, CA). Fluorescence imaging in living C. elegans was performed by anesthetizing adult worms (maintained at 20°C) in M9 containing 5 mM levamisole (tetramisole hydrochloride, L9756; Sigma-Aldrich, St. Louis, MO) and immobilizing them between a 2% agarose pad and a coverslip. Samples were imaged at room temperature (21°C) at 152 ms/frame.
The C. elegans strain expressing EGFP-tagged OSM-3 kinesin motor proteins (Snow et al. 2004 (link)) was a kind gift of Jonathan M. Scholey (University of California, Davis, Davis, CA). Fluorescence imaging in living C. elegans was performed by anesthetizing adult worms (maintained at 20°C) in M9 containing 5 mM levamisole (tetramisole hydrochloride, L9756; Sigma-Aldrich, St. Louis, MO) and immobilizing them between a 2% agarose pad and a coverslip. Samples were imaged at room temperature (21°C) at 152 ms/frame.