HOX gene

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Christmas tree, holiday, pine

How Did the Tradition of Christmas Trees Start?

Mother tickling her daughter, sitting in a garden

Why Can’t You Tickle Yourself?

Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

10 Famous Artworks by Leonardo da Vinci

Happy, smiling, flying pig

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Nativity Scene, Adoration of the Magi, Church of the Birth of the Virgin Mary, Montenegro

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American bison (Bison bison) also known as buffalo or plains buffalo on the prairie, western U.S.

What’s the Difference Between Bison and Buffalo?

HOX gene

biochemistry

Learn about this topic in these articles:

evolution

In evolution: Evolution and development
All animals have Hox genes, which may be as few as 1, as in sponges, or as many as 38, as in humans and other mammals. Hox genes are clustered in the genome. Invertebrates have only one cluster with a variable number of genes, typically fewer than 13.…
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homeotic genes

In homeotic gene
…are commonly referred to as HOX genes. Humans possess some 39 HOX genes, which are divided into four different clusters, A, B, C, and D, which are located on different chromosomes.
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