Figure 1. Mass spectra of vitreous, Staphylococcus aureus, and the mixture of both. The mixture of porcine vitreous and S. aureus (A), S. aureus (ATCC 25923F; B), and vitreous (C) was analyzed with matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS; VITEK MS). S. aureus is identified in A and B. Details regarding the approach can be found in the Materials and Methods section.