Reach Out and Touch Someone

"How do cells in the body communicate over long distances? Neurons do so through long cellular extensions—axons and dendrites—that establish direct contacts (synapses) with target cells. Other cells are thought to receive information through secreted signaling molecules that diffuse through a tissue. [...] Roy et al. provide evidence that signal-receiving cells do not passively wait, but reach out and grab the signal by making direct contact with signal-sending cells (see the figure)." Full comentary @ Science

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