Distribution of protein lengths. Predicted lengths of proteins on chromosome 6 of C. parvum and in the complete genomes of P. falciparum and C. elegans were sorted into size-bins of 100 amino acids, and the proportion of proteins in each bin were plotted for each species. Proteins longer than 2100 amino acids are not shown; the arrows on the x-axis indicate the arithmetic mean length of all proteins in each of the three species.