English: A gene gun is used for injecting cells with genetic information, it is also known as biolistic particle delivery system. Gene guns can be used effectively on most cells but are mainly used on plant cells.

Step 1 The gene gun apparatus is ready to fire.
Step 2 When the gun is turned on and the helium flows through.
Step 3 The helium moving the disk with DNA coated particles toward the screen.

Step 4 The helium having pushed the particles moving through the screen and moving to the target cells to transform the cells.