DABCYL acid is one of the most popular acceptors for developing FRET-based nucleic acid probes suh as Molecular Beacon-based PCR probes. It is also used to prepare a variety of FRET peptides that are often used for the detection of various proteases. It is predominantly paired with EDANS (as fluorescence donor) in FRET-based fluorescent probes.
 Protein N-terminal processing: substrate specificity of Escherichia coli and human methionine aminopeptidases
Authors: Qing Xiao, Feiran Zhang, Benjamin A Nacev, Jun O Liu, Dehua Pei
Journal: Biochemistry (2010): 5588--5599