Excess energy can be redistributed from photosystem II to photosystem I by a process called spillover. Chromophores contain peptides that were produced by trypsin treatment and purified in order to isolate the individual peptide-bound bilins free of overlapping absorption.
Chromophores are things or materials that give proteins color.
Phycoerythrobilins are a form of biliprotein and the term 545 means that the absorption peak for this protein is at 545 nm. Cryptomonads are the genius from where the proteins are extracted from and in this case Rhodomonas lens. Cryptobilins are species containing biliproteins which basically means that it has chromophores. Circular dichroism and absorption spectroscopy in the visible region together with various biochemical protocols have been used to study these chromophores. The CD spectrum exhibits overlapping positive and negative bands.