ITGAL編碼整合素αL鏈整合素是由α鏈和β鏈組成的異二聚體膜蛋白含有α整合素的I-結構域與β2鏈（ITGB2）結合形成整合素淋巴細胞功能相關抗原-1（LFA-1），在所有白細胞上表達LFA-1通過與其配體ICAMs 1-3（細胞間粘附分子1-3）的相互作用，在白細胞間粘附中發揮中心作用，并在淋巴細胞共刺激信號轉導中發揮作用已經發現了兩個編碼不同亞型的轉錄變體。[由RefSeq提供，2008年7月]
ITGAL encodes the integrin alpha L chain. Integrins are heterodimeric integral membrane proteins composed of an alpha chain and a beta chain. This I-domain containing alpha integrin combines with the beta 2 chain (ITGB2) to form the integrin lymphocyte function-associated antigen-1 (LFA-1), which is expressed on all leukocytes. LFA-1 plays a central role in leukocyte intercellular adhesion through interactions with its ligands, ICAMs 1-3 (intercellular adhesion molecules 1 through 3), and also functions in lymphocyte costimulatory signaling. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]