Galectin 4, or GAL-4, is another member of the Galectin family. Galectins are carbohydrate binding proteins that appear important in cell-cell contact, cell migration, and cell to cell signaling in both normal and disease (cancerous) tissues. Galectin 4 differs from its sister family members in the range of carbohydrate substrates that it binds. Galentin-4 is synthesized as a cytosolic protein, but can be externalized. During development and in adult normal tissues, galectin-4 is expressed only in the alimentary tract, from the tongue to the large intestine. It is often found in relatively insoluble complexes as a component of either adherent junctions or lipid rafts in the microvillus membrane, and it has been proposed to stabilize these structures. Strong expression of galectin-4 can be induced, however, in cancers from other tissues including breast and liver. Also, Galectin-4 appears to specifically bind CD3 on activated T-cells in the gut and regulate their activity via calpain mediated apoptosis.，官网链接：https://www.sigmaaldrich.cn/product/mm/abt242 默克 科研、开发、生产。 作为生命科学行业的全球领先供应商，我们致力于为科研、生物技术开发和生产，以及制药药物疗法开发和生产提供各类解决方案和服务。

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