. "The import of proteins into the chloroplast thylakoid membranes. Proteins that are destined for the thylakoid lumen require two uptake-targeting sequences: the first targets the protein to the stroma, and the second targets the protein from the stroma to the thylakoid lumen. Four separate thylakoid-import systems deal with the proteins once they are in the stroma." . . . . . "protein import into chloroplast thylakoid membrane" . "chloroplast thylakoid membrane protein import" . "protein transport into chloroplast thylakoid membrane" . . .