欧美……一区二区三区,欧美日韩亚洲另类视频,亚洲国产欧美日韩中字,日本一区二区三区dvd视频在线

CD184, also known as CXCR4 or Fusin, is a seven-transmembrane G protein-coupled receptor that plays a crucial role in various physiological processes. It is widely expressed on hematopoietic cells, including lymphoid and myeloid precursor cells, megakaryocytes, and endothelial cells. Its natural ligand is stromal cell-derived factor-1 （SDF-1）, a C-X-C chemokine that induces chemotaxis and enhances intracellular signaling through calcium ion influx and MAPK activation.