Monday, September 12, 2005


For anything on the embryonic development of Zebrafish, Danio rerio, Pharyngula is the place to be!

For more evidence on the Theory of Evolution, check out Deep homologies in the pharyngeal arches at Pharyngula.

What the heck is a pharyngula? "a particular stage in the development of the vertebrate embryo ... Specific cells in the pharyngeal arches will form gills or glands, depending on the species of evolutionarily conserved period when vertebrate embryos of all species are most similar to one another, and has a repeated series of pharyngeal arches. These are characteristic chordate tissues that form a 'basket' of cartilage and associated tissues in the throat; they contribute to jaws and facial structures, ear bones, gill arches, etc."

Human gland evolved from gills.

These images really tell the story. The embronic cells which become gills in fish, become glands in humans, both depending on the gene Gcm-2.

Proceedings of the National Academy of Sciences, December 2004

Okabe and Graham tell all in the Proceedings of the National Academy of Sciences.

Next: The Jawbone of an Ass....



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