The flag for Proline uses the colours red, blue, white, and black. The white dots represent the number of carbon atoms in the R-Group. But for Proline a blue dot is included since this amino acid P makes a ring structure with the root group. Usually only carbons are represented by dots, but since Proline bends back to the root at the Nitrogen atom its gets representation on the field. Proline is special indeed, it is the only amino acid to do this.
The red and dark blue stripes on the hoist code to the number 16, which represents the 16th letter of the alphabet P, which is one letter abbreviation for the amino acid. Proline also has a three letter abbreviation: Pro.
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