This directory includes the supplementary materials for "Double-stranded DNA bacteriophage prohead protease is homologous to herpesvirus protease". 1. "whole.doc" is a multiple sequence alignment of all the detected sequences in the procapsid protease superfamily (199 in total). (Microsoft Word file) 2. "total.xls" is a table of the taxonomy information of all the 199 sequences. ( Microsoft Excel file) 3. "total_def.txt" is a list of the annotations for all the 199 sequences. (Text file) 4. "Blastsearches.doc" is a figure illustrating the squence similarity searches. (Microsoft Word file).