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

CD134, also known as OX40 or tumor necrosis factor receptor superfamily member 4 （TNFRSF4）, is a type 1 transmembrane glycoprotein and a secondary co-stimulatory immune checkpoint molecule involved in long-term T cell immunity. It is transiently expressed on activated CD4+ and CD8+ T cells after T cell receptor （TCR） ligation. The interaction between CD134 and its ligand, OX40L, enhances T cell activation, proliferation, survival, and cytokine production. CD134 is crucial for maintaining an immune response beyond the initial activation phase and is being investigated as a target in cancer immunotherapy, autoimmune disease modulation, and vaccine development.