L-Arg References and Link 1)S.A. Cohen, D.P. Michaud, Synthesis of a fluorescent derivatizing reagent, 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate, and its application for the analysis of hydrolysate amino acids via high-performance liquid chromatography, Anal. Biochem. 211, 279-287 (1993) (http://www.ncbi.nlm.nih.gov/pubmed/8317704) 2) Shirakawa T, Kako K, Shimada T, Nagashima Y, Nakamura Y, Ishida J and Fukamizu A: Production of free methylarginines via the proteasome and autophagy pathways in cultured cells. Mol Med Rept 4, 615-620 (2011) (http://www.ncbi.nlm.nih.gov/pubmed/21584492)