Any protein / peptide labeling with:
- Fluorochromes - FITC, Aminomethylcoumarine (AMCA), Alexa Fluor, p-Nitroanilide (pNA), Lissamine Rhodamine B (LRB), Cyanine (Cy2), Indocarbocyanine (Cy3), Indodicarbocyanine (Cy5), Texas Red (TR), etc.
- Dabcyl, Dansyl, etc.
- Multiple labeling for FRET
- Biotin