Fluorescence microscopy was carried out as described previously [15 (link),60 (link)] using the following filter cubes: F400 (excitation: 390–410 nm; dichroic mirror: 505 nm; emission: 510–550 nm), F425 (excitation: 422–432 nm; dichroic mirror: 600 nm; emission: 610 long pass), F480 (excitation: 470–495 nm; dichroic mirror: 505 nm; emission: 510–550 nm), and F565 (excitation: 545–580 nm; dichroic mirror: 600 nm; emission: 610 nm long pass). The cells were seeded and imaged in FluoroDish cell culture dishes (World Precision Instruments, Hertfordshire, UK; FD-35) precoated with 25 μg/mL polyethyleneimine (MP Biomedicals, 195444) [46 (link)], and cellSens Dimension software (version 2.1) (Olympus Belgium) was used for image acquisition and analysis.
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