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Immunofluorescent labeling of 5-hydroxymethylcytosine (5hmC) and 5-methylcytosine (5mC). Double stained embryos with anti-5hmC antibody (green) (A, E, I), anti-5mC antibody (red) (B, F, J), merged (C, J, K), merged with DIC (D, H, L). (A-D) Pronucleus at stage PN3. (E-H) Pronucleus at stage PN5. (I-L) Two-cell embryo. Maternal pronucleus (♀) and paternal pronucleus (♂). pb, polar body. Scale bar represents 20 μm.
