日韩av大片在线观看欧美成人不卡|午夜先锋看片|中国女人18毛片水多|免费xx高潮喷水|国产大片美女av|丰满老熟妇好大bbbbbbbbbbb|人妻上司四区|japanese人妻少妇乱中文|少妇做爰喷水高潮受不了|美女人妻被颜射的视频,亚洲国产精品久久艾草一,俄罗斯6一一11萝裸体自慰,午夜三级理论在线观看无码

CD68 is a highly glycosylated type I transmembrane glycoprotein predominantly expressed in cells of the monocyte-macrophage lineage, such as macrophages, microglia, and monocytes. It is also known as macrosialin in mice. This protein is mainly localized within the endosomal/lysosomal compartments of these cells and serves as a reliable marker for them. CD68 plays a crucial role in various immune processes, including phagocytosis, antigen presentation, and the regulation of immune responses. It is involved in the clearance of cellular debris, foreign substances, microbes, and even cancer cells. In different tissues, CD68-positive cells perform diverse functions. For example, in the liver, CD68 is expressed in Kupffer cells that filter blood and remove pathogens; in the lungs, alveolar macrophages with high CD68 levels maintain pulmonary homeostasis. Additionally, CD68 is notable in the central nervous system, where microglia express this marker to maintain neural health by clearing debris and modulating inflammatory responses.