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Femtosecond laser-assisted engraving of code “07TEX” on the zona pellucida of preimplantation mouse embryos. a Embryo right after the code engraving (0.5 dpc). b Embryo on the following day (1.5 dpc) with clearly visible code. c–d Embryo at 2.5 dpc and 3.5 dpc with codes “07TEX” slightly shifted outwards but still recognizable
