Bagnato et al.9 observed that serum BDNF levels in n = 18 pDoC patients and n = 16 HCs (range 1–7.3 months after brain injury) were reduced in pDoC patients compared to HCs, also demonstrating that the level of BDNF was not modified by verticalization with robot-assisted stepping. The gene discussed is BDNF; the disease is brain injury.