While moving from cis cisternae to the trans cisternae, which molecule does not leave the cisternal lumen?

While moving from cis cisternae to the trans cisternae, which molecule does not leave the cisternal lumen? Correct Answer procollagen

Procollagen molecules are the precursors of extracellular collagen found in fibroblasts. They move from cis cisternae to the trans cisternae without ever leaving the cisternal lumen.

Related Questions

The square planar complex is known to form three isomers, two cis and one trans. Shown below are the two cis isomers of the complex. Identify the third trans isomer.
The cis-trans nomenclature is not applicable when _________