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How many different types of polypeptide can be constructed from just 5 amino acids

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Few of the Many Possible Polypeptide Chains Will Be Useful
For a typical protein length of about 300 amino acids, more than 10390 (20300) different polypeptide chains could theoretically be made.
User Eric Tune
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Answer:

i think its 5×5×5×5×5 According to the permutation formula in mathematics

User Breno Ferreira
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