Here you will find click amino acids for bioorthogonal chemistry and protein labeling, including SCO, endo-BCN and exo-BCN for copper-free SPAAC with azides, TCO* and TCO4for SPIEDAC with tetrazines, cyclopropene lysinefor tetrazine reactions, propargyl lysine (PrK) for CuAAC, and the photocrosslinking amino acids DiAzK and PrDiazK.