4P2S:
reference: Alanine Scanning Mutagenesis Identifies an Asparagine-Arginine-Lysine Triad Essential to Assembly of the Shell of the Pdu Microcompartment., Sinha S, Cheng S, Sung YW, McNamara DE, Sawaya MR, Yeates TO, Bobik TA, J Mol Biol. 2014 Apr 18. pii: S0022-2836(14)00196-X. doi:, 10.1016/j.jmb.2014.04.012. PMID: 24747050

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