As listed in Table 1, some Drosophila SPs and SPHs contain one or more clip domains, and are therefore designated c-SPs and c-SPHs, respectively. Depending on size of the mature proteins, the SPs, SPHs, c-SPs, and c-SPHs are categorized into the following six size groups: <200, 201-300, 301-400, 401-500, 501-600, and >600 amino acid residues. c-SPs and c-SPHs are not included in the SP and SPH sets. The number of proteins in each group is plotted as a bar indicated in the insets.