Figure 7.

Recalculation of the IL-8 gene expression data for the sum of particle lengths. Quantitative RT-PCR gene expression data for IL-8 collected following a 24 h exposure of HAEC to increasing doses of the amphibole samples plotted with respect to (A) sum of the particle lengths for all particles expressed as the log of the ∑ (All Particle Lengths) per cellular surface area in units of μm/cm² and (B) sum of the particle lengths for elongated mineral particles (EMP) only expressed as the log of the ∑ (EMP Lengths) with aspect ratio ≥ 3:1 per cellular surface area in units of μm/cm².