N. Wang, Y. Cui, Y. Liu, H. Fan, J. Du, Z. Huang, Y. Yuan, H. Wu, and H. Ling. Requirement and functional redundancy of Ib subgroup bHLH proteins for iron deficiency responses and uptake in Arabidopsis thaliana. Molecular Plant 2012, Doi: sss089 [pii]10.1093/mp/sss089

http://mplant.oxfordjournals.org/content/6/2/503.long