This family represents the non-globular alpha and beta chain components of phycoerythrin. The structure is a long beta-hairpin and a single alpha-helix.

1: 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;96:8901-8906. PMID:10430868