The sequence of the intermediate enzymatic steps has been shown to involve 4 different enzymes ( PsiD , PsiH , PsiK , and PsiM ) in P. cubensis and P. cyanescens .
The biosynthetic pathway may differ between species .
The sequence of the intermediate enzymatic steps has been shown to involve 4 different enzymes ( PsiD , PsiH , PsiK , and PsiM ) in P. cubensis and P. cyanescens , although the biosynthetic pathway may differ between species .