The invention provides compositions and methods to monitor delivery of nucleic acids (e.g., such as genes) to a target cell. The compositions comprise a nucleic acid delivery vehicle and a contrast agent. Preferably, the contrast agent is suitable for use in magnetic resonance imaging (MRI). The compositions...http://www.google.se/patents/US20020192688?utm_source=gb-gplus-sharePatent US20020192688 - Imaging nucleic acid delivery
