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This function returns a vector with the 20 standard amino acids in upper case.
aaList()
A character vector with the 20 standard amino acids in upper case.
Richel Bilderbeek <richel@richelbilderbeek.nl>
Lu, Y., & Freeland, S. (2006). On the evolution of the standard amino-acid alphabet. Genome biology, 7(1), 102.