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   Transition metal catalysts and enzymes are ubiquitous tools for chemical synthesis. Potential benefits of combining complementary properties of these catalysts have driven efforts to create artificial metalloenzymes (ArMs), hybrid constructs comprised of synthetic metal centers embedded within protein scaffolds. This unique composition necessitates the use of synthetic chemistry, bioconjugation methodology, and protein engineering for ArM formation. Despite this challenge, a range of approaches for ArM formation have been developed. This review provides an overview these different approaches and discussion of potential advantages and disadvantages of each. 

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