Detail of the acinar part of the gland observed with the objective of 100x. We can distinguish the serous and mucous (yellow) acini, as well as part of the network of  collagen septa that separates them. The nuclei of the secretory cells are visible in the acini: they are stained in dark blue in the mucous acini and in light blue in the serous ones, occupying the last ones a basal position. The secreted material, in form of small blue spheres, can also be observed in the serous acini.