and blocked with 6% normal goat serum (NGS) for 30 minutes, and primary antibodies in 6% NGS were applied overnight at 4°C. Sections were then washed and incubated with secondary antibodies, Cy2 antirabbit (1:400) and Cy3 anti-mouse (1:400) (both from Jackson Laboratories, West Grove, Pennsylvania), for 1 hour at room temperature. For the determination of cellular specificity, 1-m
thick sections were examined for immunofluorescent labeling by confocal microscopy.