References:
Holzmann, B., B. W. McIntyre, et al. (1989). "Identification of a murine Peyer's patch--specific lymphocyte homing receptor as an integrin molecule with an alpha chain homologous to human VLA-4 alpha." Cell 56(1): 37-46.
Neuhaus, H., M. C. Hu, et al. (1991). "Cloning and expression of cDNAs for the alpha subunit of the murine lymphocyte-Peyer's patch adhesion molecule." J Cell Biol 115(4): 1149-58.