Vitamin A status and furin expression in the lung. (A) RT-qPCR showing mRNA levels of proconvertase furin in control rats, vitamin A-deficient rats, or vitamin A-deficient rats treated with retinoic acid (RA) (n = 4–5 per group). (B) Western blot analysis of furin in lungs from control (C), vitamin A-deficient (VAD), and vitamin A-deficient rats treated with RA (VAD + RA) (n = 3). GAPDH was used for normalization and the graph on the right represents quantification of the blots of three independent cultures. For both panels, histograms represent the mean ± SD, and results that were significantly different were * p ≤ 0.05; ** p ≤ 0.01.