
Keywords: GFP; green fluorescent protein; CPC; chitosan-poly-l-cysteine; DP; the average polymerization degree; S-benzyl-l-cysteine-NCA; S-benzyl-l-cysteine-N-carboxy-anhydride; CHL cells; Chinese hamster lung cells; PBS; phosphate-buffered saline; CLSM; confocal l