2016-08-242016-08-242003-10-07http://hdl.handle.net/10919/72477The invention provides compositions and methods for use in delivering a substance of interest to a targeted cell. The substance of interest is associated with a targeting fragment of a toxin molecule or a lectin that specifically binds to a cell surface receptor, such as the B subunit of an A/B type toxin molecule. The substance of interest may be a photosensitizing agent, in which case the cell (e.g. a cancer cell) may be killed by exposure to light after delivery of the agent. Alternatively, the substance of interest may be a visualizing agent that enhances visualization of the targeted cell.application/pdfen-USB/B-like fragment targeting for the purposes of photodynamic therapy and medical imagingPatenthttp://pimg-fpiw.uspto.gov/fdd/83/312/066/0.pdf9894896128/898600/407600/1600/3A61K41/0057A61K41/0071A61K47/48261A61K49/0002A61K49/04A61K49/085A61K49/146631283