Acknowledgment

We thank Darrin Stewart for creating the new energy dot plot and structure display programs. The plt22gif and boxplot97 programs use the tgd program of Bradley K. Sherman, and this uses the gd 1.2 graphics library developed by Thomas Boutell, © 1994, 1995, Quest Protein Database Center, Cold Spring Harbor Laboratory. We thank Ann Jacobson for her suggested improvements in the software. MZ is supported by NIGMS grant GM54250. DHM and DHT are supported, in part, by NIGMS grant GM22939.