- Constitutive and inducible expression of b7 family of ligands by human airway epithelial cells. Kim, J., Myers, A.C., Chen, L., Pardoll, D.M., Truong-Tran, Q.A., Lane, A.P., McDyer, J.F., Fortuno, L., Schleimer, R.P. Am. J. Respir. Cell Mol. Biol. (2005)