UNIQUE DIATOM GENE SET. “Following secondary endosymbiosis, the different genomes of the exosymbiont and endosymbiont are predicted to have combined to form a novel and unique set of genes dispersed within the nuclear, mitochondrial, and chloroplast genomes.”
http://jxb.oxfordjournals.org/content/early/2012/01/20/jxb.err441.full