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Liquid jet and solid projectile injectors. a Jet injector (Biojector 2000) with ID spacer (white portion at end of syringe), used for investigational use only (Courtesy of BioJect). b Jet injector applied to the skin for injection (Courtesy of PharmaJet). c Epidermal powder immunization device for ID projectile injection (Courtesy of PowderMed)
