4HT7:
reference: The structure of CcmP, a tandem bacterial microcompartment domain protein from the beta-carboxysome, forms a subcompartment within a microcompartment., Cai F, Sutter M, Cameron JC, Stanley DN, Kinney JN, Kerfeld CA, J Biol Chem. 2013 May 31;288(22):16055-63. doi: 10.1074/jbc.M113.456897. Epub, 2013 Apr 9. PMID: 23572529

This OCA Structure page
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