The photos here show the injection given straight in the scruff but you actually want to vary the location with subsequent injections: sometimes use the center of the scruff, and sometimes use the loose skin towards the sides or over the shoulders. (vin.com)
When injected into mice that were then given a subsequent injection of lymphoma cells, the 3D vaccine generated a potent immune response and delayed tumor growth. (sciencedaily.com)
Instead, the increased risk for seismicity is more strongly linked with the subsequent injection of the wastewater from fracking and other oil - extraction processes into massive disposal wells that are thousands of feet underground. (caltech.edu)