1QGW:
reference: Evolution of a light-harvesting protein by addition of new subunits and rearrangement of conserved elements: crystal structure of a cryptophyte phycoerythrin at 1.63-A resolution., Wilk KE, Harrop SJ, Jankova L, Edler D, Keenan G, Sharples F, Hiller RG, Curmi PM, Proc Natl Acad Sci U S A 1999 Aug 3;96(16):8901-6. PMID: 10430868

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