Do you have any slides of pre-labeled cells or tissues that I can use to demonstrate with?
Some of the most popular are the FluoCells demonstration slides, which have cells or tissue sections that are labeled with three different dyes. FluoCells 1 and 2 have cultured cells, while FluoCells 3 is a tissue section (mouse kidney). Slides with fluorescent beads are also available.
DAPI and Hoechst dyes are quite similar to each other. Why would I choose one over the other?
DAPI is a very common blue-fluorescent dye for nuclear counterstaining and gives very bright labeling on nuclei in fixed and permeabilized cells and tissues. However, it is considered to be a semi-permeant to impermeant stain and provides inconsistent staining of live cells. Hoechst 33342 dye is cell-permeant and stains with the same binding mechanism and fluorescent color; it is preferred for live-cell imaging and is just as good as DAPI for fixed cell labeling.