ERCC3 and cystic fibrosis: Some of the most differentially expressed genes in humans compared to in vitro were virulence factors, the majority of which had increased expression in CF sputum, and included gamma-hemolysin (hlgABC), superantigen-like proteins (ssl1, ssl2, ssl3, ssl5, ssl9, ssl10, ssl12, ssl13, and ssl14), leukocidins (lukG), extracellular matrix binding proteins (emp, scc, and fnbA), and exopolysaccharide (icaABC).