Just as millions of different words are spelled with our 26-letter english alphabet, millions of different proteins are made with the 20 common what?

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The four Science Regents exams (Earth Science, Living Environment, Chemistry, and Physics) also include separately-scheduled lab practicals.
In New York, students have the opportunity to take Regents Exams in grades 9-12 and, when appropriate, in grade eight
 


Just as millions of different words are spelled with our 26-letter english alphabet, millions of different proteins are made with the 20 common what?