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Neighbor joining phylogenetic analysis of concatenated amino acids sequences of 27 universally conserved genes (9415 positions) in PGCs from GenBank database. The core genes are bchBCDFGHILMNOPXYZ-crtCF-pufABLM-lhaA-puhABCE-ascF. Bar, 0.1 substitutions per amino acids position.
