Question: Liquid Chromatography- Mass Spec A lysate was prepared from a mouse-derived cell line. Following …

Liquid Chromatography- Mass Spec A lysate was prepared from a
mouse-derived cell line. Following digestion, LC-MS/MS analysis
showed strong signals from the following peptides: YEELQITAGR and
LGEHNIDVLEGNEQFINAAK. However, neither of these peptides could be
found in a database of proteins from the mouse proteome. Why?