From pre-gut cells to glory

For all animals, development begins with the embryo. It is here that uniform cells divide and diversify, and blueprints are laid for future structures, like skeletal and digestive systems. Although biologists have known for some time that signaling processes—messages that tell a cell to express certain genes so as to become certain parts of these structures—exist at this stage, there has not been a clear framework explanation of how it all comes together.

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