Peuker, S. Department of Molecular Sensory Systems, Center of Advanced European Studies and Research (caesar), Max Planck Society;
http://www.ncbi.nlm.nih.gov/pubmed/19995976 (Any fulltext)
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2799802/pdf/zpq21637.pdf (Any fulltext)
Fleissner, M. R., Brustad, E. M., Kalai, T., Altenbach, C., Cascio, D., Peters, F. B., et al. (2009). Site-directed spin labeling of a genetically encoded unnatural amino acid. Proceedings of the National Academy of Sciences of the United States of America, 106(51), 21637-21642. doi:0912009106 [pii];10.1073/pnas.0912009106 [doi].