《自然》[Nature]13年4月11日出版pdf全文

nero1981

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$ H7 ?; N) C' L0 r6 [0 ]/ GAbout the cover
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Fossil dinosaur
# z' d7 X3 r: D0 ~embryos are extremely rare, and mainly restricted to the Late Cretaceous period. 2 a! R9 _2 B5 D7 ~, k
Hence the interest in a newly uncovered bone bed of Lower Jurassic sauropodomorph 5 w  P# F. @; P8 a4 q8 W
embryos from China, which at about 190–197 million years old is the oldest
+ q- F1 u, B& O- A  U) }& Z/ ~assemblage of such bones ever found. A three-year multinational programme of 0 `: a& H* y/ V% Y
excavation and research has yielded a treasure trove of embryonic bones, and the 6 k1 t: @& I3 L/ T" b9 p7 k
oldest known evidence of organic remains. Study of bones preserved at various 7 S7 X1 |8 K3 t4 i" [
developmental stages indicates that these large dinosaurs had a short incubation 1 f. f: @% {& d" ~* ~' X; X3 c
time and flexed their muscles while still in the egg, preparing the growing
' M& Y$ U( E% M( F4 w. Nskeleton for life in the outside world. On the cover, a coloured thin section of $ A  P& q" N: m' F) N" ~* d
an embryonic femur showing its internal tissues and large marrow cavity.
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懵懂干细胞

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