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PCA plot for the MALDI-MS data of single embryos and oocytes of (A) all samples from the five species: (a1) human (Homo sapiens) oocytes (N = 10), (a2) sheep (Ovis Aries) oocytes (N = 6), (a3) bovine (Bos taurus) oocytes (N = 6), (a4) fish (Mugil spp.) oocytes (N = 9), and (a5) insect (Solenopsis spp.) eggs (N = 6); (B) of the three mammalian species: (b1) human, (b2) sheep and (b3) bovine; and (C) of only (c3) bovine oocytes (N = 6) and (c6) bovine embryos (N = 8).
