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Human chromosomes and nucleus, colored SEM.
Human Y and X Chromosomes
Human being. Coloured scanning electron micrograph (SEM) of a human at the 16-cell stage on the tip of a pin. Yep, you once looked like that. :-)
Fertilization. Colored scanning electron micrograph (SEM) of a sperm (blue) attempting to penetrate a human egg (orange).
DNA coil with histones and chromosomes
What a chromosome really looks like
8 week human embryo