Relationship of quantitative morphological parameters in NHBE cells grown in different compositions of media. Cell area, height, and volume were measured by MetaMorph software in the confocal images of the AIC-conditioned NHBE cells in the (A) growth or (B) differentiation medium on day 3, 6, 8, or 10. Scatter plots represents coupled relationships among these parameters, cell area vs. height vs. volume.