TY - RPRT TI - A neutral loss activation method for improved phosphopeptide sequence analysis by quadrupole ion trap mass spectrometry. AU - Melanie J Schroeder AU - Jeffrey Shabanowitz AU - Jae C Schwartz AU - Donald F Hunt AU - Joshua J Coon PY - 2004 DO - 10.1021/ac0497104 UR - https://pubmed.ncbi.nlm.nih.gov/15228329/ ID - 15228329 ER -