Just a reminder from the interview where they mention those things
Mr. Toyoshima: This hair-growth direction, which is the flow of hair, is determined when hair is generated. For our published paper, we create a small incision using a small surgical knife, which, as I mentioned earlier, is in the same direction as the hair flow. When the hair follicle germ is grafted in this incision, all hair was regenerated in the same direction as the original hair flow. On the other hand, as an experiment, we also created a small incision for grafting in the opposite direction. This was an experiment using body hair. It is known that the connection direction of arrector pili muscles of hair completely align with hair flow. The results determined that the connection direction of the arrector muscles of hair, as well hair flow, was actually influenced by the surrounding tissues.
Keiko: So this is what you mentioned earlier that transplanted follicles interact with the surrounding tissues…
Mr. Toyoshima: Yes, we believe this can happen. This is dependent on types of hair, the condition of skin for transplant, etc., therefore although we cannot say that it will definitely happen, we think that the direction of regenerated hair growth will align with that of the original hair. For this, we plan to develop a clinical model in the clinical research in the future in order to further study this point.