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(a) Miniaturized 2-color fluorescence microscopy (M-2CFM) of stained tissue sections placed on a slide (1) using a side-imaging GRIN lens probe (2). (b) M-2CFM of red-fluorescent labeled macrophages. (c) Corresponding benchtop fluorescence image of the same slide used to quantify M-2CFM imaging capabilities. In-plane resolution was sufficient to view individual 10 μm diameter cells, and overall field of view was ~400 × 400 μm.
