Remember the way iPS cells are being used by Sanford Burnham. They’re not injecting them directly into the skin, they’re coverting them into highly hair inducrive DP-like cells first. The cells that actually get put into the skin are a sort of “artificial” DP cell, meaning cells not naturally taken from the body as DP cells. Still, they are effectively DP cells when SB gets through transforming them.
In Dr. Terskykh et al’s paper, they mentioned that they were in fact using human fetal or infant stem cells for this, taken from human infants’ foreskin tissues, which is a rich source (these foreskin stem cells eventually die out or disappear as the infant grows). However, they said this could ALSO be done with lab-created induced pluripotent stem cells (iPSs), but this is not what they actually did in their initial research that produced the paper.
In any event, either type of stem cell can be transformed in culture to inductive DP-like cells.