1QB2:
reference: Crystal structure of the conserved subdomain of human protein SRP54M at 2.1 A resolution: evidence for the mechanism of signal peptide binding., Clemons WM Jr, Gowda K, Black SD, Zwieb C, Ramakrishnan V, J Mol Biol 1999 Sep 24;292(3):697-705. PMID: 10497032

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