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These sniffer dogs are learning to smell the coronavirus

These sniffer dogs are learning to smell the coronavirus Jillian Kramer © None None Tuukka likes to play Frisbee. Griz adores a squishy orange ball. Toby uses his leisure time to nap or bark at passing vehicles. But these otherwise ordinary mutts have an extraordinary ability: They are part of a pack of research dogs that can sniff out the distinctive scent of SARS-CoV-2, the virus that causes COVID-19. As the disease swept the globe and scientists deployed tools such as polymerase chain reaction tests to detect the novel coronavirus in people, a team of researchers at the University of Pennsylvania’s School of Veterinary Medicine worked to determine if dogs could also be trained to find infections.

The origin of reproductive organs

 E-Mail IMAGE: Studying embryonic development in mice and monkeys, researchers led by Kotaro Sasaki of Penn Vet discovered that a layer of cells known as the posterior intermediate mesoderm (far left) gives. view more  Credit: Courtesy of Kotaro Sasaki Early in human development, during the first trimester of gestation, a fetus may have XX or XY chromosomes that indicate its sex. Yet at this stage a mass of cells known as the bipotential gonad that ultimately develops into either ovaries or testes has yet to commit to its final destiny. While researchers had studied the steps that go into the later stages of this process, little has been known about the precursors of the bipotential gonad. In a new study published in

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