The pronuclei of bovine ova fertilized in vitro.

cattlc is currently lacking. This is partly due to the granular cytoplasm of the oocytelzygote, which precludes observation in the unfixed oocytel zygote. The necessity for surgical collection of zy- gotes after fertilization in vivo at this stage, and the low success rates of in vitro fertilization (IVF)

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