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AbstractBiotechnology continues to offer routes for many exciting and unique products. Researchers genetically altered goats with a spider gene. These goats produce milk that contains a protein that can be extracted to produce biosteel fibers for use in bulletproof vests. It is referred to as “biosteel” to highlight its strength comparable to steel. This review paper describes the important aspects of produced dragline spider silk proteins via cell culture techniques using silk genes derived from two species of weaving spiders. These fibers were tested for a number of mechanical properties and compared to natural spider silk. In effect, fibers of biosteel were able to absorb similar amounts of energy as natural spider silk by stretching further. As opposed to most other synthetic fibers, biosteel is ecofriendly both in terms of its composition and production process.