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本帖最后由 细胞海洋 于 2011-7-29 23:42 编辑 2 L0 h @* v% y9 B8 Q3 V
* a' H! }0 ?3 e2 s干细胞研究的百科全书，不敢独享~stem cell? We have a basic working definition,5 q1 _# _$ i( j f: {% H2 J
but the way we observe a stem cell function: s1 Y8 n$ `* L- ~
in a dish may not represent how it functions in aliving organism. Only this is clear: Stem cells are. C& f; `; ~" I( v# I/ P" |
the engine room of multicelluar organisms for both
$ W6 u( y3 [- M6 splants and animals. They live in cave-like “niches,”0 y8 z/ K1 T# ~- l( B% y
surrounded by intricate signals that allow them to
2 F s: G1 `( R. Y: J* F2 R% M9 O; Xdivide—either to make more of themselves (selfrenew),
+ ?6 q X4 ~; v+ \or to produce a progeny that can go on: F3 o% F5 ]) X2 [
to make a specific type of tissue. They can often. M; |1 n, H# F$ y
be plucked from this environment and placed in
$ N+ {1 O+ e2 `" n" E5 K% |9 }a nutrient broth at body temperature and encouraged
, ^, H* x' L; ?3 ^! tto divide, although the niche is generally lost
W( ^( Q5 f7 v" M( \5 zand their characteristics often change.% ^7 e" K+ u4 U2 B
8 ^( `- ]" W2 ^& r0 w# P- A[hide][/hide] |
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发表于 2011-7-29 14:34
发表于 2011-7-29 23:41
发表于 2011-8-1 11:18
