Transcriptional profiling of R. sphaeroides Δirr under iron limitation (-Fe) compared to control R. sphaeroides Δirr under normal growth conditions (+Fe). Overall design: Two strain experiment under normal iron (+Fe) and iron limitation (-Fe) conditions. 6 Biological replicates, independently grown and harvested at OD660=0,4; 1-3 pooled in replicate 1, 4-6 pooled in replicate 2