RE (EDANS) EVNLDAEFK (DABCYL) R is an EDANS and DABCYL double-labeled peptide,serves as a fluorescent substrate for BACE1 (Em=360nm,Ex=528nm). RE (EDANS) EVNLDAEFK (DABCYL) R can be used for BACE1 activity measurement and the enzyme activity level is directly proportional to the fluorescence reaction.