4AK9:
reference: Evolution from the Prokaryotic to the Higher Plant Chloroplast Signal Recognition Particle: The Signal Recognition Particle RNA Is Conserved in Plastids of a Wide Range of Photosynthetic Organisms., Trager C, Rosenblad MA, Ziehe D, Garcia-Petit C, Schrader L, Kock K, Vera Richter C, Klinkert B, Narberhaus F, Herrmann C, Hofmann E, Aronsson H, Schunemann D, Plant Cell. 2012 Dec 28. PMID: 23275580

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