23 day old Arabidopsis plants, wildtype Col-0 and mutant rcd1, were compared to determine which genes are over- or under expressed in the mutant. Six biological repeats were pooled in pairs of two for labellings. All labellings/hybridizations were done with a dye swap technical repeat (e.g. in total six labellings were used). The Turku Arabidopsis 8K arrays were used for hybridizations. For the hybridizations the samples were split in two halves with each half hybridized to Turku Arabidopsis 8K slide 1 and Turku Arabidopsis 8K slide 2 (e.g. in total 12 hybridizations were performed).