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DESI mass spectra of porcine oocytes selected to show maximum differentiation. Negative ion mode mass spectra: (a) immature oocytes, (b) 24-hour in vitro matured oocytes, (c) 44-hour in vitro matured oocytes. Positive ion mode mass spectra: (d) immature oocytes, (e) 24-hour in vitro matured oocytes, (f) 44-hour in vitro matured oocytes. See Table 1 for tentative lipid class assignments of the major peaks.
