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. 2016 Nov 3;6:35772. doi: 10.1038/srep35772

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Binding affinity of the unprotected amino acids (a) and the dipeptides (b). The building blocks are sorted according to their Ca²⁺ affinity with strongest to weakest affinity from left to right. Open symbols in (a) indicate the zwitterionic form and filled symbols the uncharged/neutral form as the respective global minimum. The amino acids and dipeptides (and their protomers where applicable) were sorted according to the binding energy to Ca²⁺ from the highest to the lowest values.