S1 Effect of Alkylation on the Cellular Uptake of Polyethylene Glycol-Coated Gold Nanoparticles Lok Wai Cola Ho, Wing-Yin Yung, Kwun Hei Samuel Sy, Ho Yin Li, § Chun Kit K. Choi, Ken Cham-Fai Leung, Thomas W.Y. Lee, § Chung Hang Jonathan Choi* , , Department of Electronic Engineering (Biomedical Engineering), § School of Pharmacy, Shun Hing Institute of Advanced Engineering, The Chinese University of Hong Kong, Shatin, New Territories, and Department of Chemistry, Hong Kong Baptist University, Kowloon, Hong Kong, China *Corresponding author: Chung Hang Jonathan Choi: jchchoi@cuhk.edu.hk KEYWORDS: alkylation, cellular uptake, gold nanoparticles, polyethylene glycol, filopodia