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Iron-regulated gene clusters in P. tricornutum. With the exception of FRE2, the iron-regulated cluster genes are absent from the T. pseudonana genome. Putative components of the Fe uptake system are shown in brown. The number of ESTs retrieved from the Fe limited EST library and the R statistic are provided. R > 12 indicates a statistically significant enrichment of ESTs in the Fe limited library relative to 11 other Fe-replete EST libraries (14). qRT-PCR data are given in Table S1.
