RPGR and cervical carcinoma: Anti-RP15 antibodies were reported to be unable to inhibit M. pneumoniae adherence to primary human bronchial epithelial (HBEC) cells, human fetal lung fibroblasts (MRC-5), and human cervical carcinoma cells (HeLa)55 suggesting that RP15 may bind to specific receptors only present on the A549 cell surface.