Esterification of an unnatural amino acid structurally deviating from canonical amino acids promotes its uptake and incorporation into proteins in mammalian cells.

Takimoto JK, Xiang Z, Kang JY, Wang L. Esterification of an unnatural amino acid structurally deviating from canonical amino acids promotes its uptake and incorporation into proteins in mammalian cells. Chembiochem. 2010 Nov 02; 11(16):2268-72.