One of the most interesting new motif candidates that shows up in our analysis is a conserved palindromic motif, consisting of a highly conserved TAC... GTA separated by 6 bp of less well conserved sequence (marked with an X in Table 7 ) that is found in clusters of 2-3 closely spaced sites upstream of several genes related to fatty acid metabolism ( Figure 6 ). There is a cluster of 3 evenly spaced sites upstream of Rv3229c (linoeyl-coA desaturase), a cluster of 2 sites upstream of the adjacent Rv3230c (oxidoreductase), and a cluster of 3 sites upstream of Rv2524c (fatty acid synthase). This is the second highest-scoring new motif identified (Table  7) . This motif shows up as one of the top motifs associated with the clusters of genes upregulated under saturated fatty acid conditions (specifically palmitate).