The alpha subunits of integrin heterodimers (integrins), which mediate ligand specificity. There are approximately 18 different alpha chains, exhibiting great sequence diversity; several chains are also spliced into alternative isoforms. They possess a long extracellular portion (1200 amino acids) containing a MIDAS (metal ion-dependent adhesion site) motif, and seven 60-amino acid tandem repeats, the last 4 of which form ef hand motifs. The intracellular portion is short with the exception of integrin alpha4.


Symptoms and diagnosis

Symptoms:

    


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