4HHD:
reference: Coiled-coil dimerization of the LOV2 domain of the blue-light photoreceptor phototropin 1 from Arabidopsis thaliana., Halavaty AS, Moffat K, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2013 Dec;69(Pt 12):1316-21., doi: 10.1107/S1744309113029199. Epub 2013 Nov 28. PMID: 24316821

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