Figure 11.14 Before gas release After gas release Plunger Helium gas Gas vent Disc ●。9●●●●0●0。工 Microprojectiles with transfecting nucleic acid Fine screen Rough screen Target tissue (a) 2012 Pearson Education,Inc DNA gun for transfection of eukaryotic cells.Figure 11.14 Plunger Helium gas Gas vent Disc Microprojectiles with transfecting nucleic acid Fine screen Rough screen Target tissue Before gas release After gas release © 2012 Pearson Education, Inc. DNA gun for transfection of eukaryotic cells