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