中国、印度软件外包业国际分工、发展模式及竞争力比较
Published in 世界经济与政治论坛 • Jan 1, 2007
Authors:
胡国良
Abstract
It is well established that retinal neurogenesis in mouse embryos requires the activation of Notch signaling, but is independent of the Wnt signaling pathway. We found that genetic inactivation of Sfrp1 and Sfrp2, two postulated Wnt antagonists, perturbs retinal neurogenesis. In retinas from Sfrp1(-...
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