Cell proliferation is often associated with an increase in calmodulin, the ubiquitous intracellular calcium receptor of non-muscle cells. A long lasting increase in the proliferative activity of brown adipose tissue is induced by cold exposure in the rat. The present work showed that this phenomenon is also associated with a rapid and long lasting increase in the calmodulin content of this tissue. It was equally shown that this increase can be reproduced by noradrenaline admini-stration.

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