| 1A5R: reference: Structure determination of the small ubiquitin-related modifier SUMO-1., Bayer P, Arndt A, Metzger S, Mahajan R, Melchior F, Jaenicke R, Becker J, J Mol Biol 1998 Jul 10;280(2):275-86. PMID: 9654451 |
This OCA 
Structure page
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(documentation).