@article {Langen1435, author = {Karl-Josef Langen and Stefan Br{\"o}er}, title = {Molecular Transport Mechanisms of Radiolabeled Amino Acids for PET and SPECT}, volume = {45}, number = {9}, pages = {1435--1436}, year = {2004}, publisher = {Society of Nuclear Medicine}, issn = {0161-5505}, URL = {https://jnm.snmjournals.org/content/45/9/1435}, eprint = {https://jnm.snmjournals.org/content/45/9/1435.full.pdf}, journal = {Journal of Nuclear Medicine} }