Purple sea urchin metamorphosis controlled by histamine

Now that hay fever season has started, sufferers are well aware of the effect of histamines. However it is easy to forget that histamine is also a neurotransmitter involved in controlling memories, regulating sleep, and controlling secretion of gastric acid. New research shows that for the purple sea urchin histamine is also responsible for controlling metamorphosis from a free swimming larval form to the spiny adult living on the sea floor.

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