pre-pro-protein
A pre-protein is a form that contains a signal sequence that specifies its insertion into or through membranes. A pro-protein is one that is inactive; the full function is only present when an inhibitory sequence has been removed by proteolysis. A pre-pro-protein has both sequences still present. Pre-pro-proteins usually only accumulate as products of in vitroprotein synthesis.

Dictionary of molecular biology. 2004.

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