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Cells were then imaged at 1 Hz, 200-ms exposure using Nikon Eclipse Ti imaging system, LED fluorescence light source, and 16-bit high-sensitivity charge-coupled device (CCD) camera with excitation wavelength of 555 nm and emission detected at 580 nm using a 560/55 nm bandpass filter

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Ready for dispatch in: 1-3 working days Friendholder Cigarette Filter, Carton24x20 Filter = 1 carton with 480 FiltersUniversally fit all Friend Holder Sizes, including Slim / Ultra Slim Cigarette Tips20 Filters in Slider-BoxEach filter lasts multiple cigarettes

Neither weight nor potency are perfect, but both are substantially better proxies than price for internalizing the externalities

West, R., Hajek, P., Stead, L