Figure 1From: The lung as a route for systemic delivery of therapeutic proteins and peptidesClinical and potential routes of administration for therapeutic peptides and proteins. Note that small peptides may be absorbed in limited amounts without absorption enhancers (AE) and/or enzyme inhibitors (EI) via some routes (eg nasal). EP, electroporation/iontophoresis (specific for dermal delivery); RT, respiratory tract.Back to article page