Spectroscopic and protein chemical analyses demonstrate the presence of C-mannosylated tryptophan in intact human RNase 2 and its isoforms. (1996)

Loffler A, Doucey M, Jansson A, Muller D, de Beer T, Hess D, Meldal M, Richter W, Vliegenthart J, Hofsteenge J
Biochemistry, 1996 vol.35:12005-12014