The nucleus of a cell from a frog's intestine is transplanted into a frog's egg and gives rise to a normal frog. Such experiments aid the study of how genes are controlled during embryonic development ...

Without a brain, the frog embryo immune system doesn’t receive the signals it needs to mobilize macrophages and fight infections. A former intern at The Scientist, Amy studied neurobiology at Cornell ...

In their study, the scientists looked at 5fC in frog embryos ... suspected that 5fC must do something important in early ...