23mer oligonucleotides directed against variable sequences of a miniTn5-STM transposon set: 872
23mer genomic control sequences: 3
Each microarray slide contains two arrays each with 4608 spots in 16 grids of 18 rows and 16 columns. The 16 grids were arrayed in a 4x4 pattern. Each oligonucleotide is present in at least four replicates per array.