Malar Azagarsamy demonstrated the light-mediated release of protein from PEG nanogels. He showed the release of active ALP in vitro and that nanogels enter the cell when coupled to TAT peptides.
M.A. Azagarsamy, D.L. Alge, S.J. Radhakrishnan, M.W. Tibbitt, and K.S Anseth, "Photocontrolled Nanoparticles for On-Demand Release of Proteins," Biomacromolecules, 13 (8), 2219-2224 (2012).