Originally published at: https://boingboing.net/2020/10/14/green-glowing-venus-flytraps-reveal-their-memory-tricks.html
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This is the same mechanism for lots of cellular timing functions including synaptic facilitation (short term plasticity that lets a neuron emit a stronger signal when spikes come closer together in time). Passive calcium diffusion in a cell is minimal, so all the calcium is be actively pumped out of the cell (or into internal stores). This lets a cell regulate its time course by adding or removing pumps. Its a mechanism for short-term cellular timing that goes back billions of years.
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