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Sea anemones contain purple chromoprotein shCP which is its trans-conformation. The purple chromoprotein is derived from Glu-63, Tyr-64 and Gly-65 and the phenolic group of Tyr-64 plays a vital role in the formation of a conjugated system with the imidazolidone moiety resulting a high absorbance in the absorption spectrum of chromoprotein in the excited state and the replacement of Tyrosine with other amino acid leads to the alteration of optical property and non-planer properties of chromoprotein. Fluorescent proteins such as anthrozoa chromoproteins emits long wavelengths.

A single chromoprotein can act as both a phytochrome and a phototropin due to the presence and processing of multiple chromophores. Phytochrome in ferns contains PHY3 which contains an unusual photoreceptor with a dual-channel possessing both phytochrome(red-light sensing) and phototropin(blue-light sensing) and this helps the growth of fern plants at low sunlight. The GFP protein family includes both fluorescent proteins and non-fluorescent chromoproteins. Through mutagenesis or irradiation, the non-fluorescent chromoproteins can be converted to stable fluorescent chromoproteins. An example of such converted chromoproteins is "kindling fluorescent proteins" or KFP1 which was converted from a mutated non-fluorescent Anemonia sulcata chromoprotein to a fluorescent chormoprotein.