Lucifer yellow CH (Sigma, St. Louis, MO, USA) was selected from a series of fluorescent tracers [5 (link),6 (link)], including dextran-tetramethylrhodamine (Invitrogen, Carlsbad, CA, USA), acridine orange (Sigma), and Gd-DO3A-ethylthiourea-FITC, for in vivo measurements. The Leica TCS SP8 MP FLIM new merging function can store m × n single images during scanning. The whole image of the sample of a designated area can then be obtained by image reconstruction after scanning. Experimental fluorescence images were collected with the LSCM Merging function [6 (link),9 ].
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