Light-harvesting photosynthetic bile pigment-protein from the phycobiliprotein complex. Heterotetramer of one alpha-1, one alpha-2, and two beta chains. Contains three covalently linked bilin chromophores. The light-harvesting system in Cryptophytes contains phycobiliprotein complexes. Unusually they are composed of either phycoerythrin (CPE) or phycocyanin (CPC) but never allophycocyanin (APC), with only one type of biliprotein being present in any one species. Unlike cyanobacteria or red algae these proteins are not arranged into higher-order phycobilisome complexes, and they are found in the thylakoid lumen. Belongs to the phycobiliprotein family.