Allophycocyanin （APC） is a phycobiliprotein isolated from Spirulina sp。， a blue-green alga。 Like other phycobiliproteins， APC is fluorescent， with an extremely high absorptivity and a high quantum efficiency。 It is a protein which can be easily linked to antibodies and other proteins by conventional protein cross-linking techniques without altering its spectral characteristics。 Allophycocyanin is the least stable among the major phycobiliproteins， susceptible to dissociation at low concentrations including concentrations at which some assays are performed。 CL-APC is chemically cross-linked between ? and subunits， and is much more stable than APC。 The crosslinked allophycocyanin has improved stability in aqueous solution。 Our APC-iFluor 700 Tandem is an excellent replacement to APC-Alexa Fluor 700 Tandem since they have almost identical spectra。 On some antibodies， our APC-iFluor 700 Tandem is much brighter than APC-Alexa Fluor 700 Tandem with a higher stain index。
