Abstract
An excellent 2017 review in this journal about D-amino acids by Genchi aims for a comprehensive representation of the current state of knowledge. Unfortunately, information about both D-proline and proline racemase is almost entirely missing. In our investigations into D/L-Pro-containing neuropeptides in cicadas, we have performed literature surveys in this context. Proline racemases in bacteria are known since 1957; their function has been studied mostly in prokaryotes and, more recently, proline racemase was identified in the unicellular eukaryotic parasite Trypanosoma cruzi. Published data on D-proline and/or proline racemase in other species are rare or non-existent.
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