Brain of a zebrafish embryo. CellTracker CM-DiI.
A 30 µm–thick section of a zebrafish embryo stained with CellTracker CM-DiI (C7000, C7001) prior to immunohistochemical analysis. A one-day-old zebrafish embryo was immobilized and impaled in the hindbrain with a microelectrode filled with 1 mg/mL CellTracker CM-DiI in 95% ethanol. One day later, the brain was fixed, embedded, frozen in liquid nitrogen and sectioned on a cryostat. After blocking with 0.1% Triton X-100 in PBS containing 2% BSA and 2% normal goat serum, the 30 µm–thick section was incubated with primary anti-glial antibody in conjunction with fluorescein goat anti–mouse IgG antibody. This section was then viewed sequentially through optical filter sets appropriate for rhodamine and fluorescein, and the resulting images were superimposed. The image was contributed by William Trevarrow, Beckman Institute, California Institute of Technology.
