EurekAlert!
•84% Informative
Researchers at the Centre for Genomic Regulation in Barcelona find evidence that specialized secretory cells found in placozoans may have given rise to neurons in more complex animals.
Placozoans are tiny animals, around the size of a grain of sand, which graze on algae and microbes living on the surface of rocks and other substrates.
The first modern neuron is thought to have originated in the common ancestor of cnidarians and bilaterians around 650 million years ago .
And yet, neuronal-like cells exist in ctenophores, although they have important structural differences and lack the expression of most genes found in modern neurons.
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