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Photos of normal 4-cell human embryos from IVF
Human embryos are usually at the 4 cell stage at some point on day 2

High quality 4 cell embryo from IVF
Upper cell in middle is out of plane of focus
Zona pellucida (shell) visible as halo (not in focus)
Numerous sperm are visible attached to the outside of the zona (they lost the race)
Embryo transfer resulted in pregnancy

Another very good 4-cell embryo (different patient)
Cumulus cells from the ovary are seen at 6 to 8 o'clock
Embryo transfer resulted in pregnancy