《自然》[Nature]13年4月11日出版pdf全文

nero1981

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About the cover
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Fossil dinosaur & \3 p- _9 E! r4 x& A6 E, @1 ?
embryos are extremely rare, and mainly restricted to the Late Cretaceous period. 5 ]$ e+ c& I- a9 F' w
Hence the interest in a newly uncovered bone bed of Lower Jurassic sauropodomorph - q: D) h0 x' u+ b2 a, }3 X
embryos from China, which at about 190–197 million years old is the oldest : X% X* P5 ^6 i7 o% L3 r/ I
assemblage of such bones ever found. A three-year multinational programme of 5 S/ V) H$ G; Q9 [/ n
excavation and research has yielded a treasure trove of embryonic bones, and the ! V  b: E4 X/ V
oldest known evidence of organic remains. Study of bones preserved at various
8 c; R( Z( V& L: M2 X9 e5 T( a! l3 @+ ydevelopmental stages indicates that these large dinosaurs had a short incubation
2 g' k0 u# Q3 N( z0 u. ytime and flexed their muscles while still in the egg, preparing the growing / U) @1 U! U, X, @/ q& G
skeleton for life in the outside world. On the cover, a coloured thin section of
2 Z( |9 D" A1 ]+ `an embryonic femur showing its internal tissues and large marrow cavity. % f) z: e. \0 A, {
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[hide][/hide]# q+ ^0 ^$ |9 b' A

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懵懂干细胞

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bccu518

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wangzhiqi86

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biobio

原来是这样