A. fumigatus conidia interacting with fully differentiated human airway epithelium. Live, swollen FLARE-strain A. fumigatus conidia were incubated with fully differentiated adult human small airway epithelium derived from basal stem cells, grown at air-liquid interface. Conidia were allowed to incubate for (A) 6 hours or (B) 18 hours. Samples were stained for acetylated tubulin, a ciliated cell marker (red) and DAPI (nucleus, blue). Live conidia and hyphae express DSred (green). The FLARE strain was kindly provided by Dr. Tobias Hohl (MSKCC, New York, NY USA).