Slide DMS123 [spleen, monkey, PTS]. This is a thin section and shows cellular detail reasonably well. Once more define the red and white pulp, PALS, germinal centers. The cellular components of the latter are similar to those in lymph nodes. Examine closely the the red pulp sinusoids. In those that are relatively free of blood you may be able to identfy,using the 40x objective, the characteristic elongated endothelial cells ("stave cells"). You may also see red blood cells and white blood cells squeezing through the spaces between these cells.