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A. Elzanowski and J. Ostell (2019). The Genetic Codes Website https://www.ncbi.nlm.nih.gov/Taxonomy/Utils/wprintgc.cgi
M. Schmidt and V. Kubyshkin (2021). How To Quantify a Genetic Firewall? A Polarity-Based Metric for Genetic Code Engineering. Chembiochem 22(7): 1268-1284 https://doi.org/10.1002/cbic.202000758
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