5XDA:
reference: Structural basis for Ufm1 recognition by UfSP., Kim KH, Ha BH, Kim EE, FEBS Lett. 2018 Jan;592(2):263-273. doi: 10.1002/1873-3468.12951. Epub 2018 Jan, 4. PMID: 29251776

This OCA Structure page
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