You can find Cobra Lab Rats in all Cobra installations with labs. They are the technicians and support staff who assist Cobra's various medical and tech staff. All Cobra Lab Rats have, at minimum, a Master's degree in their field, if not a doctorate.
Since the undead plague, Cobra Lab Rats have become essential to the various studies Cobra is funding. They work long shifts doing thankless work that allows others to live.
Science Vipers all hold high-level degrees, Masters or better, in at least one field of science. Each Science Viper is the direct super visor to a minimum of five Lab Rats. Science Vipers may work directly with high level Cobra science members, like Dr. Mindbender, or may be tasked with working on independent projects for the organization.
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(I take ZERO credit for these. These awesome LBC figures came from the mind of OreoBuilder. I saw them some time ago and loved the simplicity of them. I also loved that I had the parts lying around and had no plans to ever use them so I decided to add to my Cobra science ranks.)