A stop-transfer sequence interrupts ongoing passage of a polypeptide chain across a membrane and retains a membrane-spanning segment. Protein targeting, insertion and subsequent sorting involve distinguishable sequence instructions.[ref]
Intracellular protein topogenesis by Günter Blobel. Blobel, Intracellular protein topogenesis, 1980; abstract: signal, stop-transfer, sorting and insertion sequences
In the figure's cleaved-leader example, assume the N-terminus of the mature chain has entered the ER lumen, a stop-transfer sequence remains in the membrane, and the remaining C-terminus is made on the cytosol side. The outcome differs from releasing the entire mature chain into the ER lumen. The latter is soluble cargo, potentially retained there or transported onward; entry alone does not establish secretion.
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