TY - JOUR AU - Yamil Simon AU - Pedatsur Neta AU - Xiaoyu Yang AU - Stephen Stein C2 - Journal of the American Society for Mass Spectrometry DA - 2011-01-29 LA - en M1 - 22 PB - Journal of the American Society for Mass Spectrometry PY - 2011 TI - Loss of 45 Da from a2 Ions and Preferential Loss of 48 Da from a2 Ions Containing Methionine in Peptide Ion Tandem Mass Spectra ER -