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PCA of normalized BLASTp scores obtained from plant entries of 29 selected core enzymes in phenylpropanoid pathway. Cyanobacteria (dots), primary endosymbiotic event (triangles) and secondary endosymbiotic event (squares) eukaryotic algae are plotted following the colour legend in Fig. 2. Tertiary endosymbiotic event alga Euglena is marked by a void circle.
