Video: Here's a neat video showing ink being injected into the "yolk sac artery of 72 hour-old chick embryo to visualise the beating heart and the vasculature". It's from Nikon's Small World in Motion competition which is always a great source for videos that reveal the previously unseen. Watching the ink spread throughout the yolk in this video shows how it's all connected.
Injecting An Egg Yolk With Ink Reveals The Embryo Hidden Inside
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