《自然》[Nature]13年4月11日出版pdf全文

nero1981

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1 Z" X& s: e! ]- o& q' Z) X9 ZAbout the cover
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2 F8 ^/ A, y: cFossil dinosaur
9 m( ^8 D% p1 n: X5 cembryos are extremely rare, and mainly restricted to the Late Cretaceous period. 8 S+ G1 R9 p% ?
Hence the interest in a newly uncovered bone bed of Lower Jurassic sauropodomorph
% G8 _& [5 z0 `% z# h) X  Gembryos from China, which at about 190–197 million years old is the oldest ) j, u$ O! W+ N9 v; h
assemblage of such bones ever found. A three-year multinational programme of
/ {* L( I9 ]; r: f9 V7 y% C4 b& dexcavation and research has yielded a treasure trove of embryonic bones, and the
. ]6 m6 H7 f, |$ b- woldest known evidence of organic remains. Study of bones preserved at various
1 O9 ^  n# e1 |% Y/ P2 y% }developmental stages indicates that these large dinosaurs had a short incubation
8 m& F7 V( F, p$ V9 h, t1 j% q+ jtime and flexed their muscles while still in the egg, preparing the growing 3 X0 b& e7 a1 W0 E1 Q  k4 y
skeleton for life in the outside world. On the cover, a coloured thin section of ! x* b4 ^; B$ U7 k3 Y
an embryonic femur showing its internal tissues and large marrow cavity.
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懵懂干细胞

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