Squid and human brains develop the same way despite diverging 500 million years ago

Scientists who watched nerve cells connect inside the eyes of a growing squid have uncovered a remarkable secret — the cephalopods’ brains independently evolved to develop in the same way ours do.

The discovery, made using high-resolution cameras focused on the retinas of longfin squid (Doryteuthis pealeii) embryos, reveals that, despite 500 million years of divergent evolution, the basic blueprint for how complex brains and nervous systems evolve may be the same across a wide range of species.

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