Additional file 5: Figure S4. Total hIL-33 concentrations in serum, plasma, and NF samples measured using the reduced hIL-33 iPCR assay. (A���C) Total hIL-33 concentrations measured in human NF (A), serum (B) and plasma samples (C) from nine control and nine asthma patients. ns = no significance. Data are means of duplicates or quadruplicates.