Fig. 1From: A genome-wide association study identifies risk loci for spirometric measures among smokers of European and African ancestryComparison of chromosome 15 region [CHRNA3/5, IREB2] between NHW (a and c) and AA (b and d) in COPDGene for FEV1Â (a and b), and FEV1/FVCÂ (c and d). Note that there is a similar but narrower and less significant signal in AABack to article page