The metabolites that positively correlated with thawing PM included six phospholipids (three PEs, with PE 21:4 nearly significant; and three phosphorylcholines), four oligopeptides, three sphingolipids, phosphatidylserine (PS 34:2), five organic acids or acid anhydrides (including creatine and S-adenosylhomocysteine), and seven others.
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