CIL:12920, Rattus rattus, glandular epithelial cell, milk secreting cell, mammary alveolar cell. In Cell Image Library

Immunoelectron microscopy of mammary gland tissue from lactating rats investigating potential structural interactions between mature lipid droplets, as indicated by peripheral labeling with adipophilin (smaller gold particles) and elements of the trans-Golgi network, identified by TGN38 (a transmembrane trans-Golgi protein) staining (larger gold particles). Note that trans‐Golgi cisternae in lactating mammary cells contain large amounts of casein and other milk proteins and are grossly expanded due to the osmolarity of the secreted fluid.