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B0000043CreditDr David Becker, Wellcome Images
Human embryo and sperm A human embryo, with some remaining sperm cells, about five days after fertilisation. The nuclei of both the sperm and cells of the embryo are stained purple, the tails of the sperm are green and the gap junctions, which form connections between the cells are highlighted in blue. The embryo was photographed through a confocal microscope, which creates a very sharp fluorescent image. Confocal micrograph Collection:Wellcome Images