FIGURE 3

Idiopathic lactotroph hyperplasia, Case 3. Part of a mammosomatotroph displaying two granule extrusion sites (arrowheads) is shown. The secretory granules are of variable sizes and are either bihormonal or labeled for prolactin (PRL) only, 50,400×. Immunoelectron microscopy using double-immunogold labeling. Growth hormone (GH): 20 nm, PRL: 10 nm.