- Lymphocyte homing to bronchus-associated lymphoid tissue (BALT) is mediated by L-selectin/PNAd, alpha4beta1 integrin/VCAM-1, and LFA-1 adhesion pathways. Xu, B., Wagner, N., Pham, L.N., Magno, V., Shan, Z., Butcher, E.C., Michie, S.A. J. Exp. Med. (2003)