5VYD:
reference: Purification and Characterization of RhoPDE, a Retinylidene/Phosphodiesterase Fusion Protein and Potential Optogenetics Tool from the Choanoflagellate Salpingoeca rosetta., Lamarche LB, Kumar RP, Trieu MM, Devine EL, Theobald DL, Oprian DD, Biochemistry. 2017 Oct 4. doi: 10.1021/acs.biochem.7b00519. PMID: 28976747

This OCA Structure page
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