Figure 1.

Conservation of proline repeat elements among selected eukaryotic proteins as identified by BLAST searches. (A) illustrates the major proline repeat element composition, the N-terminal onset of the repeat region, and the number of repeats in selected eukaryotic repeat element containing proteins. P, proline; Q, glutamine; N, Asparagine; X, any amino acid. (B) Corresponding eukaryotic lineages to the repeat element containing proteins listed in (A), with species including the Malaria parasite Plasmodium, well known moluscs like the Pacific oyster and the red abalone, insects such as the fruit fly Drosophila, the sea urchin as a representative echinoderm, and sarcopterygians ranging from lungfishes to humans. Note that this table only lists examples and is not meant to be comprehensive.