Getting the Message

Brain cells (neurons) communicate at synapses – junctions where chemical messages called neurotransmitters are fired towards receptors on neurons across the gap. In this electron micrograph, a slice through a mouse’s brain, we see tiny bags (called vesicles) of neurotransmitters (circular structures at the top) ready to flood into the synapse (diagonal channel) towards the waiting receptors (dark oval) on the other side. Researchers examine images like this to investigate how synapses are affected by neurodegenerative diseases, or genetic mutations. In this particular brain region, the hippocampus, losing a protein called importin β1, involved in readying the vesicles, reduces the neuronal chatter. This could affect learning and memory in the hippocampus of mice and humans alike.

Written by John Ankers

John Ankers

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A former researcher in systems biology, John is now an online biology tutor and professional coach supporting the wellbeing of scientists and NHS professionals. He's writing, too, of course.

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• Image from work by Philip A. Freund and Nicolas Panayotis, and colleagues
• Department of Biomolecular Sciences and Department of Molecular Neuroscience, Weizmann Institute of Science, Rehovot, Israel
• Image contributed and copyright held by Philip Freund
• Research published in Science Signaling, January 2026