KUL BHATIA / SCIENCE PHOTO LIBRARY KUL BHATIA / SCIENCE PHOTO LIBRARY
Fluorescent light microscopy of fibroblast cells being stimulated with glutamate. The glutamate causes fluctuations in the levels of calcium ions in the cells, which is visible as a wave of colour across the cells. These cells have been tagged with a fluorescent marker that activates in the presence of calcium ion flow. Glutamate is an important signalling molecule in the body, playing an excitatory role.
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