Heat plot of electron transfer components involved with oxidation of Fe(II) and RISCs. Heat plots were compiled using Array File Maker 4.0 (6). Red indicates levels of high transcription, black indicates average transcription (set to an LSM [least squares mean of normalized log2 transcription levels] of 0), and green indicates levels of low transcription, for M. sedula ORFs in the inoculum (d0), at 3 days of growth on CuFeS2 (d3), and at 9 days of growth on CuFeS2 (d9).