久久国产精品午夜一区_91精品國產高清久久久久久91_?级毛片免费全部播放_欧美色图在线视频一区二区三区_国产综合亚洲一区二区三区_中文字幕熟女网_国产精品男人爽免费视频_九九无码网战_亚洲日本三级电影在线观看_欧美日韩DVD手机在线不卡

CD45RO is an important cell surface marker in immunology that belongs to the CD45 family （also known as Leukocyte Common Antigen, LCA）. CD45 is a highly polymorphic transmembrane protein primarily expressed on the surface of white blood cells, including T cells, B cells, natural killer （NK） cells, monocytes, and granulocytes, and plays a crucial role in lymphocyte development, activation, and signaling. Specifically, CD45RO is an isoform of CD45 that is highly expressed on memory T cells but expressed at lower levels or not expressed on naive T cells. Memory T cells are T cells that have been activated and survived during previous immune responses, enabling them to rapidly and strongly activate upon re-encountering the same antigen, thus accelerating and enhancing immune responses. Therefore, CD45RO is often used to distinguish and identify memory T cells. It serves as an important marker in immune phenotyping analysis, disease diagnosis, immune response monitoring, and immunotherapy research.