An integrin alpha that contains an A domain. A hallmark of this class is the presence of a von Willebrand factor type A domain (Pfam:PF00092) (I-domain) of approximately 200 amino acid residues at the N terminus, which confers divalent cation binding properties. Unlike other integrin alpha proteins, they do not undergo proteolytic cleavage. [ http://pir.georgetown.edu/cgi-bin/ipcSF?id=PIRSF002497 ]