Living Colors AmCyan1 is a bright cyan fluorescent protein that was isolated from the coral reef organism Anemonia majano and is far brighter than ECFP. Cyan fluorescent proteins such as AmCyan1 are ideal for simultaneous detection of two or more events in the same cell or cell population because their excitation and emission spectra are distinct from other fluorescent proteins. The AmCyan1 fluorescent protein sequence has been optimized for translation in mammalian cells, high solubility, and bright emission.