求助一篇文献，谢谢

fan0414

Regulating the balance between symmetric and asymmetric stem cell division in the developing brain% M6 c7 }& p7 _- s' o% ^
Egger B, Gold KS, Brand AH.! `( }5 G9 V; Y# t) Z/ S; S
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Gurdon Institute and Department of Physiology, University of Cambridge, Cambridge, UK.
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