How did dogs get to the Americas? An ancient bone fragment found in Southeast Alaska holds clues
Monday AM (SitNews) - The history of dogs has been intertwined, since ancient times, with that of the humans who domesticated them.
But how far back does that history go in the Americas, and which route did dogs use to enter this part of the world?
A new study led by the University at Buffalo provides insight into these questions. The research reports that a bone fragment found in Southeast Alaska belongs to a dog that lived in the region about 10,150 years ago. Scientists say the remains a piece of a femur represent the oldest confirmed remains of a domestic dog in the Americas.
Ancient Bone Fragment Holds Clues on How Dogs Got to North America
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How did dogs get to the Americas? An ancient bone fragment holds clues
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Study illuminates the role of HAND2 gene in timing of human labor
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University at Buffalo
A study explores the role of HAND2 in human and mammalian pregnancy
Vincent Lynch, assistant professor of biological sciences
University at Buffalo
BUFFALO, N.Y. A new study illuminates how a gene called HAND2 may have a hand in the timing of human labor.
“We don’t know why humans go into labor. It’s a basic aspect of human biology that we just don’t know the answer to, and it’s kind of embarrassing that we don’t,” says senior author Vincent Lynch, an evolutionary biologist at the University at Buffalo. “What happens in many other animals is that as gestation goes on, the level of progesterone keeps going up, and then a few hours before birth, progesterone levels drop to pre-pregnancy levels. Progesterone inhibits contractions, so once you lose it, the uterus starts contracting and the baby is born.