Once inside the plant, an infolded plasma membrane forms around the bacterium to produce an infection thread.
The hand of the soldier and the two hands of the servant signify the three-fold accusation and denial; the infolded hands of Peter tellingly express both denial and repentance.
The infolded grooves served to produce a strong tooth attachment, and it is unlikely that they functioned in venom conduction.
Interestingly, there are mitochondrial-rich infolded membrane regions of the tracheolar end cells and tracheolar cells that surround tracheoles in the vicinity of their branch points.