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File:Differentiation of human tissues.PNG

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Summary

Differentiation of human tissues.

Human development begins when a sperm fertilizes an egg and creates a single cell that has the potential to form an entire organism, called the zygote (top panel, mauve). In the first hours after fertilization, this cell divides into identical cells. These cells then begin to specialize, forming a hollow sphere of cells, called a blastocyst (second panel, purple). The blastocyst has an outer layer of cells (yellow), and inside this hollow sphere, there is a cluster of cells called the inner cell mass (light blue). The inner cell mass can give rise to the germ cells—eggs and sperm—as well as cells derived from all three germ layers (ectoderm, light blue; mesoderm, light green; and endoderm, light yellow), depicted in the bottom panel, including nerve cells, muscle cells, skin cells, blood cells, bone cells, and cartilage.

Copyright status

This image is public domain because it was first published by the National Institutes of Health

Source

http://www.ncbi.nlm.nih.gov/About/primer/genetics_cell.html

File history

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Date/TimeThumbnailDimensionsUserComment
current19:42, 29 August 2007Thumbnail for version as of 19:42, 29 August 2007460 × 432 (52 KB)AshcraftDifferentiation of human tissues. Human development begins when a sperm fertilizes an egg and creates a single cell that has the potential to form an entire organism, called the zygote (top panel, mauve). In the first hours after fertilization, this cell

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