Based on the SEQUEST from database of E.coli host and target protein, the LC-MS/MS Analysis result of 40S ribosomal protein S13 could indicate that this peptide derived from E.coli-expressed Ciona intestinalis (Transparent sea squirt) (Ascidia intestinalis) RPS13.
Supplier Page from United States Biological for 40S Ribosomal Protein S13, Recombinant, Ciona intestinalis, aa2-151, His-Tag, Myc-Tag