Pieris rapae larvae possess β-cyanoalanine synthase activity in their gut.
PrBSAS1-PrBSAS3 are constitutively expressed in the larval gut.
PrBSAS1-PrBSAS3 have β-cyanoalanine synthase activity.
PrBSAS1-PrBSAS3 are the first β-substituted alanine synthases identified from insects.