Hopp, T. P.; Prickett, K. S.; Price, V. L.; Libby, R. T.; March, C. J.; Cerretti, D. P.; Urdal, D. L.; Conlon, P. J. (1988). “A short polypeptide marker sequence useful for recombinant protein identification and purification”. Nature Biotechnol.6: 1204–1210. doi:10.1038/nbt1088-1204.
Einhauer, A.; Jungbaeur, A. (2001). “The FLAG™ peptide, a versatile fusion tag for the purification of recombinant proteins”. J. Biochem. Biophys. Methods49: 455-465. doi:10.1016/S0165-022X(01)00213-5.