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embryo
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first stages of human development embryos of different animals Amniotic egg. external genitalia implanted human embryo human embryonic development human embryonic development umbilical cord formation embryonic development
Follow the development of rice-paddy fish from fertilization to hatching in a laboratory setting
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Portrait of a mountain gorilla at a short distance. gorilla close up portrait.The mountain gorilla (Gorilla beringei beringei)
Falling Stars: 10 of the Most Famous Endangered Species
Dancers at a Cinco de Mayo festival at the Mission District, San Francisco, California. (Photo dated 2019.) holidays
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Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere
Why Do Some Cicadas Appear Only Every 17 Years?
Internet http://www blue screen. Hompepage blog 2009, history and society, media news television, crowd opinion protest, In the News 2009, breaking news
Who Invented the Internet?
Poker game. Card game. Royal Flush in poker. Hearts suit gambling
Poker Hands Ranked
Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar
Ten Days That Vanished: The Switch to the Gregorian Calendar
Illustration for Demystified "How Dangerous is Quicksand"
How Deadly Is Quicksand?

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Photos and Videos

first stages of human development
embryos of different animals
Amniotic egg.
external genitalia
implanted human embryo
human embryonic development
human embryonic development
umbilical cord formation
embryonic development
Follow the development of rice-paddy fish from fertilization to hatching in a laboratory setting
Hear about the use of African clawed frogs in pregnancy tests and whole genome sequencing
How a human embryo develops into a fetus
See a movie illustrating wounded cells releasing signaling molecules causing a wave of calcium signaling
See All Videos and Images →

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Key People

Hwang Woo Suk and Gerald Schatten
Hwang Woo-Suk
South Korean scientist
Moon Shin Yong
South Korean obstetrician
Ohsumi, Yoshinori
Yoshinori Ohsumi
Japanese biologist
Étienne Geoffroy Saint-Hilaire
French naturalist
Julian Huxley
Sir Julian Huxley
British biologist
Christiane Nüsslein-Volhard
Christiane Nüsslein-Volhard
German geneticist
Eric F. Wieschaus
American developmental biologist
C.H. Waddington
British embryologist
Steen Willadsen
Danish embryologist
Sir John Graham Kerr
British biologist
Belon, detail from an engraving
Pierre Belon
French naturalist
Fabricius ab Aquapendente, oil painting by an unknown artist
Hieronymus Fabricius ab Aquapendente
Italian surgeon
William Brooks
William Keith Brooks
American zoologist
Aleksandr Onufriyevich Kovalevsky
Russian embryologist
Martin H. Rathke
German anatomist