The referenced paper (https://www.sciencedirect.com/science/article/pii/S0092867421002233 https://www.sciencedirect.com/science/article/pii/S009286742...) speci

The referenced paper (https://www.sciencedirect.com/science/article/pii/S0092867421002233 https://www.sciencedirect.com/science/article/pii/S009286742...) specifically states that it continues after the solution is changed to plain water. > Two-headed worms made this way reveal a permanent revision of the target morphology: subsequent rounds of regeneration in plain water, long after the reagent is gone from the tissue, continue to make two-headed worms.