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Spasmin

From Biology-Online Dictionary | Biology-Online Dictionary
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spasmin

(Science: protein) protein (20 kD) that forms the spasmoneme. Thought to change its shape when the calcium ion concentration rises and to revert when the calcium concentration falls: the reversible shape change is used as a motor mechanism.

contraction does not require aTP, relaxation does, probably to pump calcium ions back into the smooth endoplasmic reticulum.