||Martin W, Rujan T, Richly E, Hansen A, Cornelsen S, Lins T, Leister D, Stoebe B, Hasegawa M, Penny D. Evolutionary analysis of Arabidopsis, cyanobacterial, and chloroplast genomes reveals plastid phylogeny and thousands of cyanobacterial genes in the nucleus. Proc Natl Acad Sci U S A. 2002 Sep 1799(19):12246-51.PubMed ID12218172
||Proteins were retrieved from GenBank or from the U.S. Department of Energy web site (Nostoc and Prochlorococcus www.jgi.doe.gov/JGI_ microbial/html), The set of proteins common to 15 sequenced chloroplast genomes—the nine previously analyzed (19) plus Guillardia theta, Cyanidium caldarum, Chlorella vulgaris, Nephroselmis olivacea, Mesostigma viridis, and Oenothera elata (28–33)—were identified and assembled into a concatenated data set.
||Although chloroplast genomes encode 60-200 proteins in various plants, whereas cyanobacteria (purported ancestor of plastid) encode several thousand proteins, plastids contain roughly just as many proteins as their free-living cyanobacterial cousins