Abstract
A survey of fully grown larvae of forty-six species (thirty-one genera, fourteen families) of Diptera revealed that: 1. 1. All members of the genus Sarcophaga contained β-alanyl-tyrosine; all of Musca contained γ-glutamyl-phenylalanine; and all of Drosophila contained tyrosine- o-phosphate. 2. 2. The occurrence of the two dipeptides was not genus-specific, but nearly so. Of the forty non- Sarcophaga species examined, only the tachinid Voria ruralis possessed β-alanyl-tyrosine. Of the forty non- Musca species, only the muscid Stomoxys calcitrans had γ-glutamyl-phenylalanine. 3. 3. Tyrosine- o-phosphate was detected only in the Drosophila larvae. No a priori reason can be given for the evolution of such diverse methods of sequestering tyrosine (or its precursor, phenylalanine) among the various genera of Diptera.
Published Version
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