Sequence logos for each of six zinc finger proteins and the six DNA sites for which we have measured the affinity. M in each logo is the mutual information content in each interaction. The label at the top of each logo represents the DNA site (for the top two rows) or the protein (bottom two rows). The amino acid order is reversed so that they are lined up with the bases they contact. For example, the logo labeled "ER" shows the specificity for the RE (wild type) protein. In the lower six panels the maximum value on the y-axis is 0.5 bits.